Hi Steven, working with CF2.5 on the Mac works really great, but you have to be very patient and persistent to get a reply to your upgrade request. As you can see from the forum thread linked below, it entailed emails to Jeff and Simon and posting on the forum from 27th April till 6th May this year to get the upgrade sorted out.

https://community.clickteam.com/threads/101352-Fusion-2-5-for-MAC

There's also a problem installing the Mac Editor with the latest Mac High Sierra release which is resolved on this thread:

https://community.clickteam.com/threads/102565-Fusion-Mac-Editor-doesn-t-work-with-latest-MacOS

But it's definitely worth getting!