I gave the OS4 version a try yesterday and received an error message

I can't find a list of OS4Emu error codes, though a forum post suggests that the error codes are essentially the same as AmigaDOS. Unfortunately, this error maps to the following:

Code: 235
Description: Bad loadfile hunk
Solution: Program damaged, re-download

The OS4Emu documentation doesn't refer to additional parameters that can be tweaked. I re-downloaded it and tried to run it a few times to see if the error was caused by a broken archive. I also downloaded an earlier version of the OS4 release, which also didn't work.

If anyone has other ideas for trialling the OS4 version, I'm happy to test them out and report back to the thread.