- 2013/01/16 04:19:00 AM
You need to install the PTR into it's own folder, not the existing Diablo III folder. It's a completely separate client and you don't want to replace any existing retail files with PTR files.
I'd look for any older PTR installs and delete them. By default, for Windows 7, the folder would be C:\Program Files (x86)\Diablo III Public Test.
I've only seen that error with Diablo III back when the game first came out and we had people with the Beta still installed or closing the installer before it was finished. I've never seen it happen any other time so I'd think it's related to those scenarios.
If you can't find any, go ahead and reinstall the PTR using the "run as an administrator" option.