Did you download UP 2.0 or did you Torrent it ?
Regular large downloads can become corrupted, but a Torrent does not become corrupted (unless the original file is corrupted). A Torrent download may be slower, but it is effective because of it's not corruption and you can start the Torrent download and walk away from it (fire and forget) until it has completed the download.
Moved to the right area!
keep all help to the Il-2 technical help please! This includes mods!