I wasn't sure where to place this question, so I decided to put it here. I have Windows 7 x64 and purchased the DLC before realizing that it wouldn't install on my system. I googled the issue and found a workaround with Universal Extractor. I followed the instructions and extracted the installer, but when I tried to open Data1.cab, I get an error which says that it could not be opened even though it appears to be an InstallShield cab archive.
I don't have any available XP installations, so I'm kind of stuck as to what to do. Has anyone every had this issue before?