[@Ásgeir]
Hello Ásgeir, as reported (maybe not at the time you saw it?) in the description page https://sharewareonsale.com/s/free-msd-organizer-100-discount:
This is a sponsored version exclusively for SharewareOnSale which contains the most important modules of the program (Calendar, Contacts, Alarms, Tasks, Cards and Diary) but does not include modules for Mail, Property, Budget, Health, Music, Network messages, Complete History and News.
So it seems normal to me that you can’t access to Music. Don’t forget that SOnS allows software creators to make their product known and tried, and this leads natureally to buy some other (or enhanced) products of their own.
At least you can check this suits you and installs correctly on your system! And most often you get functionalities you would have to pay for.
HTH, M.