Looks like there is a bug in the version switch dialog of release 12.12.
I downloaded and installed DO only wanting the Light version, but was forced to install the Pro. After the temporary certificate expired, I told the software to switch me to the Light version, which brought up a dialog box saying that I needed to restart the app to do so. When when I press [OK] to proceed, nothing happens. If I manually restart, it stays with the unusable Pro version. Reinstall doesn't help either.
I hope DO has not become 'hostage-ware'.