I have just been thwarted by this.
Uninstaller version 3.2.0.84.
I tried
- safe mode
- administraror
- administrator + run as administrator.
Fortunately as administrator the uninstall from Windows worked and seemed to remove everything except the registry entry.
The installed version was 12.2.2.8012. The full installation was whatever the latest was around 3 years ago then as available updates applied.
The reson for needing total removal was the cmddata file data file being almost 70GB as in this thread
The operating system is Windows 10 Pro constantly updated by Microsoft by Microsoft updates.