Just an additional note, family tree maker for mac and family tree maker for windows are not the SAME program, in that you can't really move your data easily from one to the other. There are however ways to get your family tree maker for mac information into your fTM for windows program.
Also if you have already a tree on ANCESTRY [online] your best bet is to download it into your FTM program. [FTM 2014 one would assume, although it can work with prior versions].
Start from FTM and download your ancestry tree, choosing the option to sync or not to sync.
It may take a while if you have a lot of media to process.