I'm running Linux so my install/update process is a bit quirky.  Unfortunately Impulse doesn't work at all through Wine so to download the game I have to run Impulse in VirtualBox do the install and then copy the install into my wine prefix.  The first time it was simple and the game properly detected that it wasn't activated under my wine prefix and asked me for my information, it activated and all worked well.

Recently due to the patches and stuff I felt like playing again so I updated my installation in VirtualBox, copied over the updated install to my wine prefix, tried to run, and boom I get an error.  "The product appears to be validated but the machine SID doesn't match.  Try deleting the file C and reactivating."  I imagine C is the drive letter and it just failed to concatenate the string for the error message which is a bit unhelpful.  Since I didn't care about my old saves or anything I just deleted the games folder under appdata and tried again but got the same error.  I then tried to run the activate exe directly but it just exits without doing anything.  Anyone have any clue what file it's trying to refer to or how to clear the old activation information so I can reactivate?