--- a/ui/mainwindow.h	Tue May 20 16:39:51 2014 +0000
+++ b/ui/mainwindow.h	Tue May 20 16:40:28 2014 +0000
@@ -54,6 +54,7 @@
         BeforeDownload,
         NewListAvailable,
         NewSoftwareAvailable,
+        DownloadingSW,
         TransferError,
         NothingChanged
     };
@@ -76,13 +77,33 @@
     void installerError(const QString& errMsg);
     void installerSuccess();
     void installCerts();
-    void newSWAvailable(const QString& fileName, const QDateTime& modDate);
+
+    /* @brief Execute the file fileName to install the softwareupdate.
+     *
+     * Once the installer process is started this function terminates
+     * the application. */
+    void installNewSW(const QString& fileName, const QDateTime& modDate);
 
     void saveAutoUpdate(int state);
     void saveAutoStart(int state);
 
-    void lookUpDateForVersion();
-    void setLastModifiedDate(const QDateTime &date);
+    /** @brief get the last modified date on the download server for
+     * the current version.
+     *
+     * After the initial installation this function can be used to
+     * determine the DateTime that corresponds to the currently installed
+     * version on the download server.
+     *
+     * Calls setLastModifiedSWDate on success. Otherwise downloaderError
+     * is triggered. */
+    void getLastModForCurrentVersion();
+
+    /** @brief set the last modified software date/time
+     *
+     * The last modifiedSWDate is the corresponding last modified
+     * timestamp from the download server vor the currently installed version.
+     */
+    void setLastModifiedSWDate(const QDateTime &date);
 
     /** @brief saves the currently unselected certificates
      *