I had the same issue after updating Photo to v2.0.3 from within the app itself on Windows 11 22H2 (why I joined the forums). Photo would fail to open with "Cannot communicate with other Affinity apps. Please ensure the app is up-to-date and that your firewall isn't blocking local network traffic". If I tried opening Designer (still at v2.0.0 at the time), it would just hang on initializing at the splash screen.
After just a reboot, they were both opening normally again. I then updated Designer to v2.0.3 and everything still remained OK. So a bit of an oddity.
