Notation Composer and Musician 242 maintenance release

Hey Sherry,

yes, I do need some info regarding re-installing an older version, as I have unfortunately deleted any setups that I had.

And for clarification's sake, all of my files open with 2.4.2 accept for this one, which would terminate version 2.3.1. I simply upgraded to see if it would open again, which it didn't.

~Daniel