As of today, on MacOS Ventura 13.5.2, attempting to launch the client gives me:
haven.launcher.ValidationException: Could not validate https://enderwiggin.github.io/hafen/hafen.hl
at haven.launcher.Resource.validate(Resource.java:61)
at haven.launcher.Resource.update(Resource.java:79)
at haven.launcher.Driver.run(Driver.java:53)
at haven.launcher.Driver.main(Driver.java:144)
Suppressed: haven.launcher.ValidationException: file not downloaded over tls connection signed with key:rsa:2FA041AE61200B512AC79637E88FD833E31BC8BC7D56E6417B3D3CC14B486392
at haven.launcher.Validator$TlsKeyValidator.validate(Validator.java:43)
at haven.launcher.Resource.validate(Resource.java:55)
... 3 more
It replicates every time, and redownloading the client (from the link in the first post of this thread) didn't help.
I haven't updated anything recently - not the OS, and not Java.
I don't recall when I last launched the ender client - I tend to leave it running until it leaks so much memory that I have performance issues (yay java!) or the Mac needs to be rebooted. It's probably been about a week. Definitely not more than 11 days, as I rebooted the Mac 10 days and 21 hours ago.
The official client appears to be fine, other than having the usual deficiencies of the official client.