Just a quick update:
Loading the application via the Itch client works. Generating images still doesn't work, but I assume that's because sadly I don't have a nVidia card. The log:
Just for reference, my specs are: Ryzen 5 2600, 16GB RAM, Radeon RX 580 (4GB)
Just my luck that ~13 months after buying a (practically non-upgradeable) PC the AI art generation/restoration really becomes a thing and makes me regret not investing in a more powerful GPU (or at least a model where PSU/GPU can be upgraded).
I'll wait until the version with the fixed non-cuda image generation is uploaded and I'll give it a try again.
Thanks for your hard work and good luck!