I'm not so sure I understand your sentence 100%, but I suspect it is indeed running. Actually, I have tried to reinstall a previous version, and it (sort of works). More precisely, it works, although the interface is really ugly. But as far as the MySQL server is concerned, it proves it works anyway, I think.
As for your asking to run a command, unfortunately I don't have a CLI...
I have been thinking maybe I should use another route: install a fresh version from scratch and then copy the old database into the new one.
Is this reasonable?
If so, is there a document somewhere explaining the correspondence between the old and new databases?
Thanks again, and sorry for taking up your time.