Let me explain how the Updater work's. When the Updater start's for the first time it create's a shortcut on the desktop and create's a registry key (Installed = 1) to flag the updater as installed. Download's the files. Then also create's another one reg key called (Rev) that holds the revision number that updater have installed. That's for the first run. From now on when the updater start and there is no newer revision to download it check's only the critical files if have been modified and download's the modified files. If you press Full Check Btn it checks All the Files(Normal and Critical files). And if you repack a new revision, the updater checks the new revision that is greater than the one that is installed then checking and download all the files.