9.17b works fine with Bash.
Bash really doesn't even influence how 7zip works, so as long as 7zip works itself (whatever version), there should be no problems with Bash.
All bash does is call on 7zip as if it were at the command line. The same as you would do yourself from cmd.exe
The issue was something to do with a mismatched file or something. Not quite sure what, but it's been fixed anyway.
Alt3rn1ty:
Good call. Your tutorial is about getting a foot forward with Bash, not about getting from newb to guru

I would avoid any discussion about things like optimization, merging plugins etc.
The more direct and succinct your tutorial is, the more effective it will be.
This is why I suggested before not to offer any information the reader doesn't need to know. In fact, I would not even offer any alternatives to your instructions.
Being newbie users, it is sufficient to hold their hand step by step.
You: "do this, then do this"
Reader: "but what about X or Y?"
You: "Nevermind that for now, just do what I showed you."
When the reader has mastered the basics, then they can come back and question things or seek more advanced information elsewhere. Or you may choose to followup with an additional guide.