FortiClient update

Hi! A couple of days ago, my FortiClient began to update itself with a background process called " update_task.exe" . The process takes 100% of the CPU time and run forever. After restarting the computer, the backround update job starts automatically again. I' m currently using FortiClient 5.0.9.347 I know that there is a new Version 5.2 online so I tried to install it. I expected that this update bug is fixed in the newest version. After starting the installation routine I get an German error message " Das richtige FortiClient Image wurde nicht auf dem Server gefunden" which means that there is no proper FortiClient image found on the server. This error occours right after starting the installer after loading the file list from the server. Is it possible to fix the update problem of version 5.0.9.347? Deactivating this functionality will also work but I can' t find an entry in the settings for deactivating the auto update. Is there a offline installer available for version 5.2 which doesn' t need a image from the server? Thanks, Domar