Index: typo3/sysext/em/classes/connection/class.tx_em_connection_extdirectserver.php
===================================================================
--- typo3/sysext/em/classes/connection/class.tx_em_connection_extdirectserver.php	(revision 10120)
+++ typo3/sysext/em/classes/connection/class.tx_em_connection_extdirectserver.php	(revision )
@@ -71,10 +71,15 @@
 	/**
 	 * Constructor
 	 *
+	 * @param boolean $createTemplateInstance: set to FALSE if no instance of template class needs to be created
 	 * @return void
 	 */
-	public function __construct() {
+	public function __construct($createTemplateInstance = TRUE) {
+			// Create an instance of template class only if necessary
+			// It is necessary only if extension configuration is to be displayed
+		if ($createTemplateInstance) {
-		$this->template = t3lib_div::makeInstance('template');
+			$this->template = t3lib_div::makeInstance('template');
+		}
 		$this->globalSettings = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['em']);
 	}
 
Index: typo3/sysext/install/updates/class.tx_coreupdates_installsysexts.php
===================================================================
--- typo3/sysext/install/updates/class.tx_coreupdates_installsysexts.php	(revision 10120)
+++ typo3/sysext/install/updates/class.tx_coreupdates_installsysexts.php	(revision )
@@ -37,7 +37,23 @@
 class tx_coreupdates_installsysexts extends Tx_Install_Updates_Base {
 	protected $title = 'Install Outsourced System Extensions';
 	protected $newSystemExtensions = array('info', 'perm', 'func', 'filelist', 'about', 'cshmanual', 'feedit', 'opendocs', 'simulatestatic');
+		/**
+		 * Instance of the EM connection class, used to install new extensions
+		 *
+		 * @var tx_em_Connection_ExtDirectServer
+		 */
+	protected $extensionManagerConnection;
 
+	public function __construct() {
+			// Create an instance of language, if necessary.
+			// Needed in order to make the em_index work
+		if (!isset($GLOBALS['LANG'])) {
+			$GLOBALS['LANG'] = t3lib_div::makeInstance('language');
+			$GLOBALS['LANG']->csConvObj = t3lib_div::makeInstance('t3lib_cs');
+		}
+			// Create an instance of a connection class to the EM
+		$this->extensionManagerConnection = t3lib_div::makeInstance('tx_em_Connection_ExtDirectServer', FALSE);
+	}
 	/**
 	 * Checks if an update is needed
 	 *
@@ -179,24 +195,33 @@
 	 * @return	boolean		whether it worked (true) or not (false)
 	 */
 	public function performUpdate(&$dbQueries, &$customMessages) {
-		$result = false;
+		$result = FALSE;
 
-		// Get extension keys that were submitted by the used to be installed and that are valid for this update wizard:
+			// Get extension keys that were submitted by the used to be installed and that are valid for this update wizard:
 		if (is_array($this->pObj->INSTALL['update']['installSystemExtensions']['sysext'])) {
 			$extArray = array_intersect(
 				$this->newSystemExtensions,
 				array_keys($this->pObj->INSTALL['update']['installSystemExtensions']['sysext'])
 			);
-			$extList = $this->addExtToList($extArray);
-			if ($extList) {
-				$this->writeNewExtensionList($extList);
-				$result = true;
+			foreach ($extArray as $extensionKey) {
+				$this->installExtension($extensionKey);
 			}
+			$result = TRUE;
 		}
 
 		return $result;
 	}
 
+	/**
+	 * This method can be called to install an extension following all proper processes
+	 * (e.g. installing in both extList and extList_FE, respecting priority, etc.)
+	 *
+	 * @param string $extensionKey Key of the extension to install
+	 * @return void
+	 */
+	protected function installExtension($extensionKey) {
+		$this->extensionManagerConnection->enableExtension($extensionKey);
+	}
 
 	/**
 	 * Adds extension to extension list and returns new list. If -1 is returned, an error happend.
@@ -204,8 +229,10 @@
 	 *
 	 * @param	array		Extension keys to add
 	 * @return	string		New list of installed extensions or -1 if error
+	 * @deprecated since TYPO3 4.5, will be removed in TYPO3 4.7 - Should not be needed anymore. Extension should be installed directly by calling tx_coreupdates_installsysexts::installExtension()
 	 */
 	function addExtToList(array $extKeys) {
+		self::logDeprecatedFunction();
 			// Get list of installed extensions and add this one.
 		$tmpLoadedExt = $GLOBALS['TYPO3_LOADED_EXT'];
 		if (isset($tmpLoadedExt['_CACHEFILE'])) {
@@ -226,8 +253,10 @@
 	 *
 	 * @param	string		List of extensions
 	 * @return	void
+	 * @deprecated since TYPO3 4.5, will be removed in TYPO3 4.7 - Use tx_coreupdates_installsysexts::installExtension() instead (one call per extension to install)
 	 */
-	protected function writeNewExtensionList($newExtList)	{
+	protected function writeNewExtensionList($newExtList) {
+		self::logDeprecatedFunction();
 			// Instance of install tool
 		$instObj = new t3lib_install;
 		$instObj->allowUpdateLocalConf = 1;
@@ -242,4 +271,4 @@
 		t3lib_extMgm::removeCacheFiles();
 	}
 }
-?>
\ No newline at end of file
+?>