Error installing newer Tryton 5.0 version

On Windows 10, an attempt to uninstall Tryton 5.0, in order to upgrade to newest minor version, yields this error:

C:\Program Files (x86)\Tryton-5.0\uninstall.exe

An error in a system binary was detected.  Try refreshing the PC to fix the problem.

Restarting doesn’t help. Has anyone else experience this?

Tested here without any problem. It sounds like a problem on the OS side.
Any way the tryton installation process is mainly about copying file in the Tryton folder and register some keys in the registry and menu shortcut. You can find the operation to manually undo them in setup.nsi.

@ced Thank you so much, for testing it, and for the advice on the uninstall process.

Solved. The issue was just not running as admin. (I wish Windows would improve their error messages.)