We're working on putting together an installation error collection in this forum. We're not there yet. Without seeing your specific computer, it sounds like it didn't uninstall correct and a folders still exists with americascardroom folders inside it.
My first step is to find that folder and delete it.
Then reinstall the software.
The only folder is the one that the ACR setup creates and I've confirmed that it deletes the whole folder when uninstalled. I had the same result the first attempt and the fifth attempt.
I'm using a pretty new computer so it's easy to see what all is on it.
After rereading the error message, it seems the problem is the absence of a "win" file from the setup package. I created a "win" subfolder in the ACR folder just to try, and that seems to prevent that error message from coming up, but then it just sits on the "Unpacking New Version" box for an infinite amount of time without moving on. so what file should be in that "win" folder that is not installing?