I had no compatibility issues setting up FM8. The installation and set up process is very simple and straightforward. However, the software itself is very complex and hard to understand at first. To the new user, FM8 will probably be overwhelming.
Native Instruments FM 7 is very easy to use and to understand you wont need a manual nor will you have any issues running it with your system no matter what system you have. I have ran it on macs and pc’s and have seen it work on some really old syst