my file was already named TS3.exe and I am getting the same error message.
i had this same problem, no solutions worked. then i discovered the problem is in the registry! the base game entry in the registry is pointing to the wrong location! i also recommend you note down the location that it thinks its in becuz your update files will probably be there and you'll have to move them manually!
i think the update patcher does this if your game is installed anywhere other than the default location which is C:\Program Files (x86)\Electronic Arts\Sims 3 if i remember correctly
incase you dont know or forgot
What am I supposed to do after I expand these folders in the registry?
