I opted into the windows insider program yesterday, then I launched outplayed and it gave me an error and said Windows Insider not supported.
I found out an easy way to get around this is just to add "AllowInsider=true"
to the SetupInfo.ini in C:\ProgramData\Overwolf\Setup, and voila! everything is working fine now.
I feel like people in the windows insider program should still be allowed access, just with like something reminding them that certain features could not work as intended due to compatibility issues with windows insider.