Usenapp doesn’t require Rosetta, because it is (was) native M1.
aerobatic however, this didn’t help.. I had hoped it would.
Of course, that does not work because it used the M1 executable.
However, Usenapp v1.18 is been released today which supports the Intel Par2 executable on the M1.
But even then, I wonder if this is the problem. I have not experienced this myself on the M1 Macs and everything is repaired perfectly. Even with the M1 Par2 executable.
You can switch between the Par2 executables in Preferences->Download->Advanced