I learned a little scsh long ago, so thought I'd give it a spin. I just installed the "scheme48" package from my package manager, it was 1.9.2, and followed the few steps in scsh's README. 1 minute later, painlessly, I have an up-to-date scsh. Still works like I remember.
I also found https://srfi.schemers.org/srfi-170/srfi-170.html , which is a standardised version of half of the scsh functionality.
In conclusion, I still like the tool and would recommend it. Shame the interfaces were never implemented on top of other interpreters, e.g. Gerbil , but I am forced to agree with >>4 that for whatever reasons all attempts in other Schemes failed around the 80% mark.