I downloaded one from the primary Polish website and one from a link provided elsewhere in this forum (fangaming.com). Neither of the TWEE_Upgrade.exe will work, even though both match the same MD5 as what has been posted here.EDIT: Per later user's suggestion, I downloaded one from GamersHell. It worked successfully, unlike two others I'd downloaded from the Polish site and Fan Gaming. I can't figure out what or why - the MD5 sums all match, the file sizes are identical, the parity seems to be fine. I dunno what makes it different, but this one worked and the others didn't.Hope this helps others, here's the GamersHell link:http://www.gamershell.com/download_32976.shtml