Patch 1.0.1 "can not replace existing file"

[jens]

Sounds like you a problem with the permissions of the files or that one of the files are in use by another application for some reason.

Try to uninstall the game(this will not delete the saved games you have) then install again and directly apply the 1.0.1 update. If it is a problem with the permissions not all files might be deleted on an uninstall, so when you do the new install install the game into a new location to make sure all files are new.