I had heard of it; but, have not used it; as, I am not an "Apple"/"Mac" user ...
I took a look in the "Solutions Gallery" of 'FamilySearch' ...
And, found it there, it is 'FamilySearch' "Compatible" ...
That said ...
I cannot see anything there about 'downloading' your "Ancestral" lines (as, we DO NOT have a "Tree", just "Branches", that are interconnected, in this SINGLE "One" World "Tree", for all of us, that is) from 'Family Tree" of 'FamilySearch' to "MacFamilyTree".
But, I did see:
✅️ This app can read information from your FamilySearch Account
✅️ This app can update information from your FamilySearch Account
✅️ This app can support LDS Features
- Comparing local and FamilySearch persons improved
Of course, there possibly could be; but, you will have to investigate that particular programme.
As a suggestion, try, the "Help" feature; and, the "Frequently Asked Questions" section (if there is one), they may be able to provide you with some assistance.
Of course, if you do not find anything there, you could send off an enquiry to the company = "Synium Software Germany"
I hope this helps.