@paul_gormley, I've got all the main files downloaded, working on getting the remaining additional content files down now.

I'm running Poser on a 2011 27" iMac, 12 GB RAM/1 TB HDD for my test machine. If that goes well, then I'll do the upgrade on my 2015 Mac Mini and then 12" Retina MacBook (8 GB RAM/512 GB SSD.) I actually use the Mac Mini for most of my Poser rendering these days due to it having more free disk space available. Will be looking forward to getting a new iMac sometime in the future. The Mac Mini handles FireFly and SuperFly rendering well. I always looked down at the Mini until I got one. Now I'm a fan of the little Mac. LOL! I believe I had a MacBook Air i7/8 GB RAM/512 GB SSD of about the same year as you have. I loved that MacBook and traded it in for the 12" Retina MacBook in January 2017. It's been a treat to use that machine and is capable beyond what the specs might suggest. Can't wait to see how Poser Pro 11.2 works on each of my Macs!