diff --git a/phpBB/adm/style/acp_main.html b/phpBB/adm/style/acp_main.html
index 4af3f1a62c..efcb25cb68 100644
--- a/phpBB/adm/style/acp_main.html
+++ b/phpBB/adm/style/acp_main.html
@@ -14,7 +14,11 @@
 
 	<p>{L_ADMIN_INTRO}</p>
 
-	<!-- IF S_VERSIONCHECK_FAIL -->
+	<!-- IF S_UPDATE_INCOMPLETE -->
+		<div class="errorbox">
+			<p>{L_UPDATE_INCOMPLETE} <a href="{U_VERSIONCHECK}">{L_MORE_INFORMATION}</a></p>
+		</div>
+	<!-- ELSEIF S_VERSIONCHECK_FAIL -->
 		<div class="errorbox notice">
 			<p>{L_VERSIONCHECK_FAIL}</p>
 			<p>{VERSIONCHECK_FAIL_REASON}</p>
diff --git a/phpBB/adm/style/acp_update.html b/phpBB/adm/style/acp_update.html
index 0cc995959b..351a3ba26c 100644
--- a/phpBB/adm/style/acp_update.html
+++ b/phpBB/adm/style/acp_update.html
@@ -6,11 +6,16 @@
 
 <p>{L_VERSION_CHECK_EXPLAIN}</p>
 
+<!-- IF S_UPDATE_INCOMPLETE -->
+	<div class="errorbox">
+		<p>{L_UPDATE_INCOMPLETE} {L_UPDATE_INCOMPLETE_MORE}</p>
+	</div>
+<!-- ENDIF -->
 <!-- IF S_UP_TO_DATE -->
 	<div class="successbox">
 		<p>{L_VERSION_UP_TO_DATE_ACP} - <a href="{U_VERSIONCHECK_FORCE}">{L_VERSIONCHECK_FORCE_UPDATE}</a></p>
 	</div>
-<!-- ELSE -->
+<!-- ELSEIF not S_UPDATE_INCOMPLETE -->
 	<div class="errorbox">
 		<p>{L_VERSION_NOT_UP_TO_DATE_ACP} - <a href="{U_VERSIONCHECK_FORCE}">{L_VERSIONCHECK_FORCE_UPDATE}</a></p>
 	</div>
@@ -18,10 +23,21 @@
 
 <fieldset>
 	<legend></legend>
+	<!-- IF not S_UPDATE_INCOMPLETE -->
 	<dl>
 		<dt><label>{L_CURRENT_VERSION}</label></dt>
 		<dd><strong>{CURRENT_VERSION}</strong></dd>
 	</dl>
+	<!-- ELSE -->
+	<dl>
+		<dt><label>{L_FILES_VERSION}</label></dt>
+		<dd><strong>{FILES_VERSION}</strong></dd>
+	</dl>
+	<dl>
+		<dt><label>{L_DATABASE_VERSION}</label></dt>
+		<dd><strong>{CURRENT_VERSION}</strong></dd>
+	</dl>
+	<!-- ENDIF -->
 </fieldset>
 
 <!-- BEGIN updates_available -->
@@ -38,6 +54,11 @@
 	</fieldset>
 <!-- END updates_available -->
 
+<!-- IF S_UPDATE_INCOMPLETE -->
+	{INCOMPLETE_INSTRUCTIONS}
+	<br>
+<!-- ENDIF -->
+
 <!-- IF not S_UP_TO_DATE -->
 	{UPDATE_INSTRUCTIONS}
 	<br /><br />
diff --git a/phpBB/includes/acp/acp_main.php b/phpBB/includes/acp/acp_main.php
index 529c3a1835..f44bbbc88d 100644
--- a/phpBB/includes/acp/acp_main.php
+++ b/phpBB/includes/acp/acp_main.php
@@ -459,6 +459,12 @@ class acp_main
 			$template->assign_var('S_VERSION_UP_TO_DATE', true);
 		}
 
+		// Incomplete update?
+		if (phpbb_version_compare($config['version'], PHPBB_VERSION, '<'))
+		{
+			$template->assign_var('S_UPDATE_INCOMPLETE', true);
+		}
+
 		/**
 		* Notice admin
 		*
diff --git a/phpBB/includes/acp/acp_update.php b/phpBB/includes/acp/acp_update.php
index 52897e1043..e42367d8a1 100644
--- a/phpBB/includes/acp/acp_update.php
+++ b/phpBB/includes/acp/acp_update.php
@@ -63,5 +63,17 @@ class acp_update
 
 			'UPDATE_INSTRUCTIONS'	=> sprintf($user->lang['UPDATE_INSTRUCTIONS'], $update_link),
 		));
+
+		// Incomplete update?
+		if (phpbb_version_compare($config['version'], PHPBB_VERSION, '<'))
+		{
+			$database_update_link = append_sid($phpbb_root_path . 'install/database_update.' . $phpEx);
+
+			$template->assign_vars(array(
+				'S_UPDATE_INCOMPLETE'		=> true,
+				'FILES_VERSION'				=> PHPBB_VERSION,
+				'INCOMPLETE_INSTRUCTIONS'	=> $user->lang('UPDATE_INCOMPLETE_EXPLAIN', $database_update_link),
+			));
+		}
 	}
 }
diff --git a/phpBB/language/en/install.php b/phpBB/language/en/install.php
index b202df85be..407b0616bd 100644
--- a/phpBB/language/en/install.php
+++ b/phpBB/language/en/install.php
@@ -178,6 +178,7 @@ $lang = array_merge($lang, array(
 	'DB_PASSWORD'			=> 'Database password',
 	'DB_NAME'				=> 'Database name',
 	'DB_USERNAME'			=> 'Database username',
+	'DATABASE_VERSION'		=> 'Database version',
 	'TABLE_PREFIX'			=> 'Prefix for tables in database',
 	'TABLE_PREFIX_EXPLAIN'	=> 'The prefix must start with a letter and must only contain letters, numbers and underscores.',
 
@@ -213,6 +214,14 @@ $lang = array_merge($lang, array(
 	//
 	'EMAIL_CONFIG'	=> 'E-mail configuration',
 
+	// Package info
+	'PACKAGE_VERSION'					=> 'Package version installed',
+	'UPDATE_INCOMPLETE'				=> 'Your phpBB installation has not been correctly updated.',
+	'UPDATE_INCOMPLETE_MORE'		=> 'Please read the information below in order to fix this error.',
+	'UPDATE_INCOMPLETE_EXPLAIN'		=> '<h1>Incomplete update</h1>
+
+		<p>We noticed that the last update of your phpBB installation hasn’t been completed. Visit the <a href="%1$s" title="%1$s">database_update script</a> and run it. If it is missing, please <a href="https://www.phpbb.com/downloads/" title="phpBB downloads">download your package version</a>, upload the "install" folder to your phpBB root directory (where your config.php file is) and <a href="%1$s" title="%1$s">run the database update script</a>.</p>',
+
 	//
 	// Server data
 	//
@@ -432,6 +441,7 @@ $lang = array_merge($lang, array(
 	'FILES_NOT_MODIFIED_EXPLAIN'	=> 'The following files are not modified and represent the original phpBB files from the version you want to update from.',
 	'FILES_UP_TO_DATE'				=> 'Already updated files',
 	'FILES_UP_TO_DATE_EXPLAIN'		=> 'The following files are already up to date and do not need to be updated.',
+	'FILES_VERSION'					=> 'Files Version',
 	'TOGGLE_DISPLAY'				=> 'View/Hide file list',
 
 	// File updater