I was having that problem too. The solution I found that works was to install outside of the program files (I use Vista) so that I can extact the mod directly to the game folder. Outside of that make sure that you don't change the RPAwhatever files yourself (The newest patch seems to do that) as that seemed to casue some problems for me. I can't remember if I needed to run the PATCHme.exe as admin or not, I don't think I did.
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