I had the same problem not being able to get OpenRGB to run after tried everything above and reinstalled. I don't know if you still have the problem but here is how I fixed it.

Deleting the whole openrgb folder does not really uninstall it completely, there is still data like profiles in the appdata/roaming folder. I suppose my problem is one of the profile name I created was not in English, which caused the problem.

If you still can get it running, maybe try reinstalling again. Delete the whole openrgb folder, and then go to C/users/"yourusername"/AppData/Roaming and delete the openrgb folder there.