Dear friends,
I would like to comment that Sebastian, an intern of my company, just ported the MatchTool to Pharo 9. You may find the install instructions in the following link :)
https://github.com/jordanmontt/MatchTool-Spec2
Please, help us to test it, any feedback is welcome.
Regards,
Juan P. Sandoval
http://www.semantics.bo/
https://jpsandoval.github.io/