diff --git a/phpBB/adm/style/installer_form.html b/phpBB/adm/style/installer_form.html
index a38f33c7c2..592d361d1e 100644
--- a/phpBB/adm/style/installer_form.html
+++ b/phpBB/adm/style/installer_form.html
@@ -1,3 +1,4 @@
+<!-- IF FORM_TITLE --><h1>{FORM_TITLE}</h1><!-- ENDIF -->
 <form id="<!-- IF FORM_ID -->{FORM_ID}<!-- ELSE -->install_install<!-- ENDIF -->" method="POST" action="{U_ACTION}">
 <!-- IF .options -->
 <!-- IF S_NOT_ONLY_BUTTON_FORM -->
@@ -8,9 +9,9 @@
 		<!-- IF options.S_LEGEND -->
 			<!-- IF not options.S_FIRST_ROW -->
 			</fieldset>
-
-			<fieldset>
 			<!-- ENDIF -->
+			<fieldset>
+
 		<legend>{options.LEGEND}</legend>
 		<!-- ELSE -->
 		<dl>
@@ -49,7 +50,7 @@
 <fieldset class="submit-buttons">
 	<legend>{L_SUBMIT}</legend>
 	<!-- BEGIN submit_buttons -->
-	<input class="button1<!-- IF submit_buttons.DISABLED --> disabled<!-- ENDIF -->" type="submit" name="{submit_buttons.KEY}" value="{submit_buttons.TITLE}"<!-- IF submit_buttons.DISABLED --> disabled="disabled"<!-- ENDIF --> />
+	<input class="<!-- IF not submit_buttons.IS_SECONDARY -->button1<!-- ELSE -->button2<!-- ENDIF --><!-- IF submit_buttons.DISABLED --> disabled<!-- ENDIF -->" type="submit" name="{submit_buttons.KEY}" value="{submit_buttons.TITLE}"<!-- IF submit_buttons.DISABLED --> disabled="disabled"<!-- ENDIF --> />
 	<!-- END submit_buttons -->
 </fieldset>
 <!-- ENDIF -->
diff --git a/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php b/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php
index bce0149890..dd584eff30 100644
--- a/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php
+++ b/phpBB/phpbb/install/helper/iohandler/ajax_iohandler.php
@@ -187,6 +187,7 @@ class ajax_iohandler extends iohandler_base
 			$tpl_ary['KEY'] = $input_name;
 			$tpl_ary['S_EXPLAIN'] = false;
 			$tpl_ary['DISABLED'] = isset($input_options['disabled']) ? $input_options['disabled'] : false;
+			$tpl_ary['IS_SECONDARY'] = isset($input_options['is_secondary']) ? $input_options['is_secondary'] : false;
 
 			if (isset($input_options['default']))
 			{
@@ -218,6 +219,11 @@ class ajax_iohandler extends iohandler_base
 			$this->template->assign_block_vars($block_name, $tpl_ary);
 		}
 
+		if (isset($form['database_update_submit']) && !$form['database_update_submit']['disabled'])
+		{
+			$this->template->assign_var('FORM_TITLE', $this->language->lang('UPDATE_CONTINUE_UPDATE_PROCESS'));
+		}
+
 		$this->template->assign_var('S_NOT_ONLY_BUTTON_FORM', $not_button_form);
 
 		if (!$not_button_form)
diff --git a/phpBB/phpbb/install/module/update_filesystem/task/diff_files.php b/phpBB/phpbb/install/module/update_filesystem/task/diff_files.php
index 1792a3b723..8151a24f2d 100644
--- a/phpBB/phpbb/install/module/update_filesystem/task/diff_files.php
+++ b/phpBB/phpbb/install/module/update_filesystem/task/diff_files.php
@@ -103,8 +103,8 @@ class diff_files extends task_base
 		$old_path = $this->update_helper->get_path_to_old_update_files();
 		$new_path = $this->update_helper->get_path_to_new_update_files();
 
-		$files_to_diff = $this->installer_config->get('update_files', array());
-		$files_to_diff = $files_to_diff['update_with_diff'];
+		$update_files = $this->installer_config->get('update_files', array());
+		$files_to_diff = $update_files['update_with_diff'];
 
 		// Set progress bar
 		$this->iohandler->set_task_count(count($files_to_diff), true);
@@ -154,7 +154,6 @@ class diff_files extends task_base
 				}
 
 				$diff = new \diff3($file_contents[0], $file_contents[1], $file_contents[2]);
-				unset($file_contents);
 
 				// Handle conflicts
 				if ($diff->get_num_conflicts() !== 0)
@@ -162,12 +161,20 @@ class diff_files extends task_base
 					$merge_conflicts[] = $filename;
 				}
 
-				// Save merged output
-				$this->cache->put(
-					'_file_' . md5($filename),
-					base64_encode(implode("\n", $diff->merged_output()))
-				);
+				if ($diff->merged_output() !== $file_contents[1])
+				{
+					// Save merged output
+					$this->cache->put(
+						'_file_' . md5($filename),
+						base64_encode(implode("\n", $diff->merged_output()))
+					);
+				}
+				else
+				{
+					unset($update_files['update_with_diff'][$key]);
+				}
 
+				unset($file_contents);
 				unset($diff);
 			}
 			else
@@ -199,6 +206,16 @@ class diff_files extends task_base
 				$this->installer_config->set('merge_conflict_list', $merge_conflicts);
 				$this->installer_config->set('file_diff_update_count', $progress_count);
 
+				foreach ($update_files as $type => $files)
+				{
+					if (empty($files))
+					{
+						unset($update_files[$type]);
+					}
+				}
+
+				$this->installer_config->set('update_files', $update_files);
+
 				// Request refresh
 				throw new resource_limit_reached_exception();
 			}
@@ -206,6 +223,16 @@ class diff_files extends task_base
 
 		$this->iohandler->finish_progress('ALL_FILES_DIFFED');
 		$this->installer_config->set('merge_conflict_list', $merge_conflicts);
+
+		foreach ($update_files as $type => $files)
+		{
+			if (empty($files))
+			{
+				unset($update_files[$type]);
+			}
+		}
+
+		$this->installer_config->set('update_files', $update_files);
 	}
 
 	/**
diff --git a/phpBB/phpbb/install/module/update_filesystem/task/download_updated_files.php b/phpBB/phpbb/install/module/update_filesystem/task/download_updated_files.php
index 21aa93b7ea..0b83e9a79d 100644
--- a/phpBB/phpbb/install/module/update_filesystem/task/download_updated_files.php
+++ b/phpBB/phpbb/install/module/update_filesystem/task/download_updated_files.php
@@ -99,13 +99,14 @@ class download_updated_files extends task_base
 			// Add form to continue update
 			$this->iohandler->add_user_form_group('UPDATE_CONTINUE_UPDATE_PROCESS', array(
 				'update_recheck_files_submit'	=> array(
-					'label'	=> 'UPDATE_RECHECK_UPDATE_FILES',
-					'type'	=> 'submit',
+					'label'			=> 'UPDATE_RECHECK_UPDATE_FILES',
+					'type'			=> 'submit',
+					'is_secondary'	=> empty($file_update_info),
 				),
 				'database_update_submit'	=> array(
 					'label'		=> 'UPDATE_CONTINUE_UPDATE_PROCESS',
 					'type'		=> 'submit',
-					'disabled'	=> count($file_update_info) > 0,
+					'disabled'	=> !empty($file_update_info),
 				),
 			));