rivalcfg: "An error occured when updating mouse settings!" on Windows

Hi! After considering whether it was a good idea to install a 150MB mouse driver to disable a distracting lighting effect and deciding “probably not”, I installed rivalcfg. It appears to be detecting my Rival 300 mouse correctly on my Windows 10 2004 computer with Python 3.7, but when I try to update the colour with rivalcfg.exe -c d11bd6 -C d11bd6 , I get “An error occured when updating mouse settings!”.

How can I get more details than this error gives so I can understand what the issue might be?