Anyone else having trouble getting this to work?

I tried building myself, and the build ended with a certificate error. (I get it, distributing software always hits unexpected snags.)

Then I installed from zip and when I use preview (in the screen saver options,) I just get a blank screen. There's a message at the top of the screen, but most of it is truncated from the notch from the camera.

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Edit: I tried adding sources, but they don't seem to download. Not sure why. Sigh.