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I made a few updates. Now I've got into the state where I press the build/paint button and the Blender crashes with an error: module 'gpu' has no attribute 'offscreen'

The viewport drawing code in particular will need a heavy rewrite, because support was dropped for the calls sprytile currently uses.
Do you mean those calls to glBegin(), glEnd() and everything else gl-related? I've seen a lot of them. So they aren't work anymore?