Convert from Musescore 4.4 to Musescore 4.3?

I am trying to use PracticeFirst with my students, but I have just discovered (after inputting several files into Musescore 4.4) that it will only upload scores in 4.3 or earlier.

Is there an easy way to convert my Musescore 4.4 files into 4.3?

[Argh!]

Jamin