Something weird happened with the last auto-update - not sure what's going on.
You can directly run it the auto-update. In the install directory (most likely C:\Program Files (x86)\MindBullet\McDIE) there's a program called WyUpdate.exe.
If you run that it should get the update.
Alternately you can re-download the installer from itch.
Sorry for the inconvenience. Still trying to figure out what went wrong.