I'm having a problem upgrading to 7.1.4.0 (from 6.21.0.0) on Win 8.1 - never had a previous problem.
Installation stops about 2/3 of the way through with the error:
"The specified path 'C:\Windows\Installer\Config.Msi\' is unavailable"
The path is correct, and I've played about with permissions till I'm blue in the face.
Won't even install in safe mode, as administrator, or anything else that I can try.
Ideas, anyone?