Note, however, for the small number of consumers who are encountering the "Disc not Found" error - please do not install this patch, but rather contact support@kalypsomedia.com for a specific fix.
It's important to note that this is a patch only for the -boxed retail version- of the game, and should not be applied to digitally purchased (Steam, Direct2Drive, etc.) versions of the game. Digital purchases will, or have already been, automatically patched by those service providers.