Slightly off-topic since it's most likely not with the application itself, but thought maybe there's some advice to be had from those who managed to get it working..
When trying to launch I get "FAIL: XR_FB_passthrough functions unavailable."
From my searches so far I guess Meta decided to disable/hide some of these these functions regarding allowing passthrough over link etc., and I have no Beta/Dev menus in the Link application anymore.
Tried some registry entries that were suggested in forums, but same result. Re-installed drivers and a fresh install on another computer as well with same result.