Someone else has reported an issue with the client crashing immediately on an M1 mac, which sounds like the same issue Client does not open on Mac M1 · Issue #315 · CasparCG/client · GitHub
Unfortunately as a primarily linux user, it running fine on my m1 mac mini, and noone really looking after the client these days, I dont know how to go about fixing this.
All I can suggest is run the client on a non-macos machine, or perhaps try a different client? New CasparCG client: SuperConductor released is one that people I work with recommend (because they made it)