Yes. The downloadable collections do work on Mac. The CDs with Shape Collections # 1, # 2 and # 3, are not Mac compatible.
Monkey and I are not Mac users (yet) and that means we will only be able to provide very limited support. For that reason, it is an especially good idea to join the Inklingo Yahoo group, where there are friendly Mac users who may be able to help if you have questions about downloading, activating or printing on Mac.