The following link seems to work for me:

https://store.makemusic.com/Downloads/Default.aspx?id=539 

NB: NotePad 2012 requires OS 10.12 or earlier.

Hi Peter

That's really kind of you, thank you!

My OS is 11.07.10, so it seems I'm stuck?

Many thanks, again 

Rebecca

… My OS is 11.07.10, so it seems I'm stuck? …

Indeed it looks like you need a MakeMusic product newer than NotePad 2012.

No promises, but you could try NotePad 2012 in OS 11.07.10 - if you manage to install NotePad 2012 on OS 11.07.10, you may find that some of NotePad’s features do not work.

… My OS is 11.07.10, so it seems I'm stuck? …

 

Indeed it looks like you need a MakeMusic product newer than NotePad 2012.

No promises, but you could try NotePad 2012 in OS 11.07.10 - if you manage to install NotePad 2012 on OS 11.07.10, you may find that some of NotePad’s features do not work.

One can certainly try but it absolutely will not work. You need a Mac old enough to run macOS 10.5–10.9 in order to install NotePad 2012. You can then update the OS to Yosemite and is should still run. 2012 will not run over Sierra or later even if correctly installed over an earlier OS.

Later versions of Finale can open the file, however—even those of us running up to Finale 27 should be able to open your file and export as MusicXML 3.0. You can certainly email a file to me to see if I can convert it.   m i k e (a) h a l l o r a n m u s i c dot c o m