New Mac OS X Catalina users probalby got the message: "ScreenSaverGallery.saver" can't be opened because Apple cannot check it for malicious software. Please, (a) download and reinstall ScreenSaverGallery or (2) allow opening app in a System Preferences:

🍏 – System Preferences – Security & Privacy – Open Anyway

While first run you need to confirm “Open” once

Than ScreenSaverGallery will work properly. Updated version figured out this behavior.

We are sorry for the inconvenience.