. . . . Music Maker Edition with 64bit has been crashing since resent update. MGXFEB2021 . . . .
Updates have version numbers eg 29.0.5.32 being the latest - what is the current version of Music Maker (MMM) 2021 as found under Help, About, and the variant - Free, Plus, Premium or one of the special editions?
What version were you running before the update?
More information on the crashing is needed, eg is it reproducible , if so what steps cause the crash?
I am having the same problem with this version. I can reproduce it. Is when using the soundpool "House by the Sea" Brass area. starting with TrumpSolo B, then on down the list ,when you select one of them then the program crashes.
Please read the post by @johnebaker directly above yours, and answer the questions he asks. We really do need that additional information in order to have any chance of being able to help you.