diff --git a/config/controllers.yml b/config/controllers.yml
index 3b6bde8bb..860496ac5 100644
--- a/config/controllers.yml
+++ b/config/controllers.yml
@@ -411,6 +411,12 @@ services:
             - [set_tool, ["@phpbb.titania.manage.tool.composer.rebuild_repo"]]
         parent: phpbb.titania.controller.manage.tool
 
+    phpbb.titania.controller.manage.demo.install_all:
+        class: phpbb\titania\controller\manage\tool\demo\install_all
+        calls:
+            - [set_tool, ["@phpbb.titania.manage.tool.demo.install_all"]]
+        parent: phpbb.titania.controller.manage.tool
+
     phpbb.titania.controller.manage.search.reindex:
         shared: false
         calls:
diff --git a/config/routes/manage.yml b/config/routes/manage.yml
index d4764178e..5f31cc794 100644
--- a/config/routes/manage.yml
+++ b/config/routes/manage.yml
@@ -90,6 +90,10 @@ phpbb.titania.manage.contrib.update_release_topics:
     path: /administration/contrib/update_release_topics
     defaults: { _controller: phpbb.titania.controller.manage.contrib.update_release_topics:handle }
 
+phpbb.titania.manage.demo.install_all:
+    path: /administration/demo/install_all
+    defaults: { _controller: phpbb.titania.controller.manage.demo.install_all:handle }
+
 phpbb.titania.manage.search.reindex:
     path: /administration/search/reindex
     defaults: { _controller: phpbb.titania.controller.manage.search.reindex:handle }
diff --git a/config/services.yml b/config/services.yml
index b0343ebc5..e6b0f95d4 100644
--- a/config/services.yml
+++ b/config/services.yml
@@ -264,6 +264,14 @@ services:
             - '%tables.topics%'
             - '%tables.users%'
 
+    phpbb.titania.manage.tool.demo.install_all:
+        class: phpbb\titania\manage\tool\demo\install_all
+        arguments:
+            - '@dbal.conn'
+            - '@user'
+            - '@phpbb.titania.config'
+            - '@phpbb.titania.style.demo.manager'
+
     phpbb.titania.manage.tool.search.reindex:
         class: phpbb\titania\manage\tool\search\reindex
         shared: false
diff --git a/contribution/style/demo/manager.php b/contribution/style/demo/manager.php
index 2933ee645..b21a11f73 100644
--- a/contribution/style/demo/manager.php
+++ b/contribution/style/demo/manager.php
@@ -47,6 +47,9 @@ class manager
 	/** @var \titania_contribution */
 	protected $contrib;
 
+	/** @var array|null Map of style_path to style_active on the demo board */
+	protected $installed_styles;
+
 	/**
 	* Constructor.
 	*
@@ -76,10 +79,24 @@ public function __construct(\phpbb\user $user, $container, $ext_config, $php_ext
 	*/
 	public function configure($branch, $contrib, $package)
 	{
-		$this->branch = $branch;
 		$this->contrib = $contrib;
 		$this->package = $package;
 
+		return $this->set_branch($branch);
+	}
+
+	/**
+	* Set the branch and connect to its demo board.
+	*
+	* @param int $branch
+	*
+	* @return bool Returns false if no usable demo board is configured for the branch.
+	*/
+	public function set_branch($branch)
+	{
+		$this->branch = $branch;
+		$this->installed_styles = null;
+
 		if (empty($this->ext_config->demo_style_path[$this->branch]))
 		{
 			return false;
@@ -99,6 +116,36 @@ public function configure($branch, $contrib, $package)
 		return $this->db_connect();
 	}
 
+	/**
+	* Check whether a style is present and active on the demo board.
+	*
+	* The board's styles table and the style directory are both checked, so a
+	* wiped database or a wiped filesystem each count as not installed.
+	*
+	* @param string $dir_name	Style directory name, as built by get_style_dir_name().
+	*
+	* @return bool
+	*/
+	public function is_style_installed($dir_name)
+	{
+		if ($this->installed_styles === null)
+		{
+			$this->installed_styles = array();
+
+			$sql = 'SELECT style_path, style_active
+				FROM ' . $this->table_prefix . 'styles';
+			$result = $this->db->sql_query($sql);
+
+			while ($row = $this->db->sql_fetchrow($result))
+			{
+				$this->installed_styles[$row['style_path']] = (bool) $row['style_active'];
+			}
+			$this->db->sql_freeresult($result);
+		}
+
+		return !empty($this->installed_styles[$dir_name]) && is_dir($this->board_root_path . 'styles/' . $dir_name . '/');
+	}
+
 	/**
 	* Get result.
 	*
@@ -265,16 +312,28 @@ protected function db_connect()
 		return true;
 	}
 
+	/**
+	* Build the style directory name used on the demo board.
+	*
+	* @param string $contrib_name_clean
+	* @param int $contrib_id
+	* @return string
+	*/
+	public function get_style_dir_name($contrib_name_clean, $contrib_id)
+	{
+		return $contrib_name_clean . '_' . $contrib_id;
+	}
+
 	/**
 	* Get style directory name.
 	*
 	* @param bool $name_only		If false, returns the full path to the directory,
 	*	otherwise just the name.
-	* @retun string
+	* @return string
 	*/
 	public function get_style_dir($name_only = false)
 	{
-		$dir_name = $this->contrib->contrib_name_clean . '_' . $this->contrib->contrib_id;
+		$dir_name = $this->get_style_dir_name($this->contrib->contrib_name_clean, $this->contrib->contrib_id);
 
 		if ($name_only)
 		{
diff --git a/controller/manage/administration.php b/controller/manage/administration.php
index 2febe8ca8..005a292f8 100644
--- a/controller/manage/administration.php
+++ b/controller/manage/administration.php
@@ -64,11 +64,25 @@ public function list_tools()
 			),
 		);
 
+		foreach ($this->ext_config->demo_style_path as $branch => $path)
+		{
+			if (empty($path))
+			{
+				continue;
+			}
+			$tools['INSTALL_DEMO_STYLES_' . $branch] = array(
+				'route'		=> 'phpbb.titania.manage.demo.install_all',
+				'params'	=> array('branch' => $branch),
+				'title'		=> $this->user->lang('INSTALL_DEMO_STYLES', $this->get_branch_name($branch)),
+				'ajax'		=> true,
+			);
+		}
+
 		foreach ($tools as $title => $info)
 		{
 			$this->template->assign_block_vars('tools', array(
-				'L_TITLE'			=> $this->user->lang($title),
-				'U_TITLE'			=> $this->helper->route($info['route']),
+				'L_TITLE'			=> isset($info['title']) ? $info['title'] : $this->user->lang($title),
+				'U_TITLE'			=> $this->helper->route($info['route'], isset($info['params']) ? $info['params'] : array()),
 				'S_AJAX'			=> $info['ajax'],
 			));
 		}
@@ -78,6 +92,23 @@ public function list_tools()
 		return $this->helper->render('manage/administration.html', 'ADMINISTRATION');
 	}
 
+	/**
+	* Get the display name of a phpBB branch.
+	*
+	* @param int $branch	Branch in the form of 33 for 3.3.
+	* @return string Returns the configured branch name, like phpBB 3.3.x.
+	*/
+	protected function get_branch_name($branch)
+	{
+		$versions = $this->ext_config->phpbb_versions;
+
+		if (isset($versions[$branch]['name']))
+		{
+			return $versions[$branch]['name'];
+		}
+		return 'phpBB ' . implode('.', str_split((string) $branch));
+	}
+
 	/**
 	* Check user's authorization.
 	*
diff --git a/controller/manage/tool/demo/install_all.php b/controller/manage/tool/demo/install_all.php
new file mode 100644
index 000000000..d8355d3c1
--- /dev/null
+++ b/controller/manage/tool/demo/install_all.php
@@ -0,0 +1,84 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Customisation Database package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\titania\controller\manage\tool\demo;
+
+use phpbb\exception\http_exception;
+use phpbb\titania\controller\manage\tool\tool;
+
+class install_all extends tool
+{
+	/**
+	 * {@inheritDoc}
+	 *
+	 * Tells the user how many styles are missing from the demo board before
+	 * asking for confirmation.
+	 *
+	 * @throws http_exception If the branch has no usable demo board.
+	 */
+	protected function confirm_action()
+	{
+		$submit = $this->request->is_set('submit');
+		$hash = $this->request->variable('hash', '');
+
+		if (confirm_box(true) || ($submit && check_link_hash($hash, 'titania_manage')))
+		{
+			return true;
+		}
+		$pending = $this->tool
+			->set_branch($this->request->variable('branch', 0))
+			->count_pending();
+
+		if ($pending === false)
+		{
+			throw new http_exception(200, 'INSTALL_DEMO_STYLES_NOT_CONFIGURED');
+		}
+		confirm_box(false, $this->user->lang('INSTALL_DEMO_STYLES_CONFIRM', $pending));
+
+		return false;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	protected function get_next_params(array $result)
+	{
+		return array_merge(
+			parent::get_next_params($result),
+			array(
+				'branch'	=> $result['branch'],
+				'installed'	=> $result['installed'],
+				'already'	=> $result['already'],
+				'skipped'	=> $result['skipped'],
+				'failed'	=> $result['failed'],
+			)
+		);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	protected function run()
+	{
+		return $this->tool
+			->set_branch($this->request->variable('branch', 0))
+			->set_start($this->request->variable('start', 0))
+			->run(
+				$this->request->variable('installed', 0),
+				$this->request->variable('already', 0),
+				$this->request->variable('skipped', 0),
+				$this->request->variable('failed', 0)
+			)
+		;
+	}
+}
diff --git a/language/en/manage_tools.php b/language/en/manage_tools.php
index 873b4cc0f..3cd93da98 100644
--- a/language/en/manage_tools.php
+++ b/language/en/manage_tools.php
@@ -59,6 +59,12 @@
 	'SECTION_STATUS'	=> 'part %d of %d',
 	'TRUNCATING_SEARCH'	=> 'Truncating Search',
 
+	'INSTALL_DEMO_STYLES'					=> 'Install all approved styles on the %s demo board',
+	'INSTALL_DEMO_STYLES_COMPLETE'			=> 'Styles installed on the demo board: %1$d. Already installed and skipped: %2$d. Skipped with no package for this branch: %3$d. Failed to install: %4$d.',
+	'INSTALL_DEMO_STYLES_CONFIRM'			=> '%d approved styles are not installed on this demo board. Are you sure you want to run this tool?',
+	'INSTALL_DEMO_STYLES_NOT_CONFIGURED'	=> 'No style demo board is configured for this branch.',
+	'INSTALL_DEMO_STYLES_PROGRESS'			=> '%1$d styles completed of %2$d. Please wait…',
+
 	'PLEASE_WAIT'		=> 'Please wait...',
 
 	'REBUILD_COMPOSER_REPO'	=> 'Rebuild Composer repository',
diff --git a/manage/tool/demo/install_all.php b/manage/tool/demo/install_all.php
new file mode 100644
index 000000000..5700b99f4
--- /dev/null
+++ b/manage/tool/demo/install_all.php
@@ -0,0 +1,306 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Customisation Database package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\titania\manage\tool\demo;
+
+use phpbb\db\driver\driver_interface as db_driver_interface;
+use phpbb\titania\config\config as ext_config;
+use phpbb\titania\contribution\style\demo\manager as demo_manager;
+use phpbb\titania\ext;
+use phpbb\titania\manage\tool\base;
+use phpbb\user;
+
+class install_all extends base
+{
+	/** @var db_driver_interface */
+	protected $db;
+
+	/** @var user */
+	protected $user;
+
+	/** @var ext_config */
+	protected $ext_config;
+
+	/** @var demo_manager */
+	protected $demo_manager;
+
+	/** @var string */
+	protected $contribs_table;
+
+	/** @var string */
+	protected $revisions_table;
+
+	/** @var string */
+	protected $revisions_phpbb_table;
+
+	/** @var int */
+	protected $branch = 0;
+
+	/** @var bool|null Whether the branch has a usable demo board */
+	protected $board_ready;
+
+	/** @var int Each item extracts a package and calls the demo board hook, so keep batches small. */
+	protected $limit = 5;
+
+	/**
+	 * Constructor
+	 *
+	 * @param db_driver_interface $db
+	 * @param user $user
+	 * @param ext_config $ext_config
+	 * @param demo_manager $demo_manager
+	 */
+	public function __construct(db_driver_interface $db, user $user, ext_config $ext_config, demo_manager $demo_manager)
+	{
+		$this->db = $db;
+		$this->user = $user;
+		$this->ext_config = $ext_config;
+		$this->demo_manager = $demo_manager;
+		$table_prefix = $ext_config->__get('table_prefix');
+		$this->contribs_table = $table_prefix . 'contribs';
+		$this->revisions_table = $table_prefix . 'revisions';
+		$this->revisions_phpbb_table = $table_prefix . 'revisions_phpbb';
+	}
+
+	/**
+	 * Set the phpBB branch to install style demos for.
+	 *
+	 * @param int $branch
+	 * @return $this
+	 */
+	public function set_branch($branch)
+	{
+		$this->branch = (int) $branch;
+		$this->board_ready = null;
+
+		return $this;
+	}
+
+	/**
+	 * Check that the branch has a usable demo board and connect to it.
+	 *
+	 * @return bool
+	 */
+	protected function board_ready()
+	{
+		if ($this->board_ready === null)
+		{
+			$this->board_ready = $this->demo_manager->set_branch($this->branch);
+		}
+
+		return $this->board_ready;
+	}
+
+	/**
+	 * Count the styles the tool would install on the demo board.
+	 *
+	 * A style counts when it is not installed on the demo board and its latest
+	 * validated revision for the branch is approved and submitted, mirroring
+	 * what get_download() will select when the tool runs.
+	 *
+	 * @return int|bool Returns false if the branch has no usable demo board.
+	 */
+	public function count_pending()
+	{
+		if (!$this->board_ready())
+		{
+			return false;
+		}
+		$sql = 'SELECT c.contrib_id, c.contrib_name_clean, MAX(v.revision_id) AS revision_id
+			FROM ' . $this->contribs_table . ' c
+			JOIN ' . $this->revisions_phpbb_table . ' v
+				ON (v.contrib_id = c.contrib_id
+					AND v.phpbb_version_branch = ' . $this->branch . '
+					AND v.revision_validated = 1)
+			WHERE c.contrib_type = ' . ext::TITANIA_TYPE_STYLE . '
+				AND c.contrib_status = ' . ext::TITANIA_CONTRIB_APPROVED . '
+				AND c.contrib_visible = 1
+			GROUP BY c.contrib_id, c.contrib_name_clean';
+		$result = $this->db->sql_query($sql);
+		$candidates = array();
+
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			if (!$this->is_installed($row))
+			{
+				$candidates[(int) $row['revision_id']] = true;
+			}
+		}
+		$this->db->sql_freeresult($result);
+
+		if (empty($candidates))
+		{
+			return 0;
+		}
+		$sql = 'SELECT COUNT(revision_id) AS cnt
+			FROM ' . $this->revisions_table . '
+			WHERE ' . $this->db->sql_in_set('revision_id', array_keys($candidates)) . '
+				AND revision_status = ' . ext::TITANIA_REVISION_APPROVED . '
+				AND revision_submitted = 1';
+		$result = $this->db->sql_query($sql);
+		$pending = (int) $this->db->sql_fetchfield('cnt');
+		$this->db->sql_freeresult($result);
+
+		return $pending;
+	}
+
+	/**
+	 * Run the tool.
+	 *
+	 * @param int $installed	Styles installed by previous batches
+	 * @param int $already		Styles already installed, skipped by previous batches
+	 * @param int $skipped		Styles without a package, skipped by previous batches
+	 * @param int $failed		Styles failed in previous batches
+	 * @return array
+	 */
+	public function run($installed = 0, $already = 0, $skipped = 0, $failed = 0)
+	{
+		if (!$this->board_ready())
+		{
+			return array_merge(
+				$this->get_result('INSTALL_DEMO_STYLES_NOT_CONFIGURED', 0, false),
+				array(
+					'branch'	=> $this->branch,
+					'installed'	=> 0,
+					'already'	=> 0,
+					'skipped'	=> 0,
+					'failed'	=> 0,
+				)
+			);
+		}
+
+		$total = $this->get_total();
+
+		foreach ($this->get_batch() as $row)
+		{
+			if ($this->is_installed($row))
+			{
+				$already++;
+				continue;
+			}
+			$contrib = new \titania_contribution;
+
+			if ($contrib->load((int) $row['contrib_id']) === false)
+			{
+				$failed++;
+				continue;
+			}
+			$contrib->get_download();
+
+			if (empty($contrib->download[$this->branch]))
+			{
+				$skipped++;
+				continue;
+			}
+			$revision = new \titania_revision($contrib);
+			$revision->__set_array($contrib->download[$this->branch]);
+
+			if ($contrib->type->install_demo($contrib, $revision) === '')
+			{
+				$failed++;
+			}
+			else
+			{
+				$installed++;
+			}
+		}
+
+		$next_batch = $this->start + $this->limit;
+
+		if ($next_batch >= $total)
+		{
+			$result = $this->get_result(
+				$this->user->lang('INSTALL_DEMO_STYLES_COMPLETE', $installed, $already, $skipped, $failed),
+				$total,
+				false
+			);
+		}
+		else
+		{
+			$result = $this->get_result(
+				$this->user->lang('INSTALL_DEMO_STYLES_PROGRESS', $next_batch, $total),
+				$total,
+				$next_batch
+			);
+		}
+
+		return array_merge($result, array(
+			'branch'	=> $this->branch,
+			'installed'	=> $installed,
+			'already'	=> $already,
+			'skipped'	=> $skipped,
+			'failed'	=> $failed,
+		));
+	}
+
+	/**
+	 * Check whether a contribution's style is already installed on the demo board.
+	 *
+	 * @param array $row	Contribution row with contrib_name_clean and contrib_id.
+	 * @return bool
+	 */
+	protected function is_installed($row)
+	{
+		return $this->demo_manager->is_style_installed(
+			$this->demo_manager->get_style_dir_name($row['contrib_name_clean'], $row['contrib_id'])
+		);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function get_total()
+	{
+		if ($this->total === null)
+		{
+			$sql = 'SELECT COUNT(contrib_id) AS cnt
+				FROM ' . $this->contribs_table . '
+				WHERE contrib_type = ' . ext::TITANIA_TYPE_STYLE . '
+					AND contrib_status = ' . ext::TITANIA_CONTRIB_APPROVED . '
+					AND contrib_visible = 1';
+			$result = $this->db->sql_query($sql);
+			$this->total = (int) $this->db->sql_fetchfield('cnt');
+			$this->db->sql_freeresult($result);
+		}
+
+		return $this->total;
+	}
+
+	/**
+	 * Get the batch of contributions to process.
+	 *
+	 * @return array
+	 */
+	protected function get_batch()
+	{
+		$sql = 'SELECT contrib_id, contrib_name_clean
+			FROM ' . $this->contribs_table . '
+			WHERE contrib_type = ' . ext::TITANIA_TYPE_STYLE . '
+				AND contrib_status = ' . ext::TITANIA_CONTRIB_APPROVED . '
+				AND contrib_visible = 1
+			ORDER BY contrib_id';
+		$result = $this->db->sql_query_limit($sql, $this->limit, $this->start);
+		$rows = $this->db->sql_fetchrowset($result);
+		$this->db->sql_freeresult($result);
+
+		return $rows;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public function get_route()
+	{
+		return 'phpbb.titania.manage.demo.install_all';
+	}
+}