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It appears that that everything works as it should.
Side-by-side installation of different x.y versions is
supported; different x.y.z versions cannot  simultaneously
be installed (IOW, you can have 2.3 and 2.4 on the same
machine just fine).

It further appears that the only indication of a problem
that you have is that the third-party library doesn't offer
installation for 2.4. This may or may not be correct,
depending on that library - you should bring this up with
the authors of that library.

Closing this as not-a-bug.