For PC Client version V2R02M134 and below, there is an issue with the built-in uninstaller.
Attached is an uninstaller that can be used.
How to use it?
Download the uninstaller and save it to your computer.
Make sure that RushFiles is not running.
Right click the uninstaller and choose "Run as administrator".
The uninstaller will now open as expected and remove the client.
For versions V2R02M137 and above, the PC Client can be uninstalled from Apps & Features or Control Panel -> Uninstall a program.
The attached uninstaller will not work for these versions.