Alfred, Hi. No I didn’t get any error messages when I uninstalled an earlier version of Designer. But, Walt, I admit I have not tried installing Microsoft Uninstaller Troubleshooter and using it. (phew! What a palaver!)
The subsequent downloads: affinity-designer-1.8.3.exe (494,722KB) which I installed but got the “Windows cannot access the specified device…” message for, I did not strictly speaking ‘uninstall’ as they were not installed, I deleted them.
Am I doing the right thing by trying to ‘run as Administrator’ the affinity-designer-1.8.3.exe file? It is not a zip file so surely I don’t need to unzip it!
(I’m having exactly the same problems, same alerts, with Affinity Photo and Publisher by the way.)