I have been a Capture One Pro and Phase One user for many years and now, only to find out, because I have Mac OS 10.7.4 I can't upgrade to v. 8. My Mac Pro was top of the line in 2007 and since them I've upgraded to larger hard drives, lots more RAM, etc. but can't go any higher than OS 10.7.4. Any way at all, to get C1 8 to run on this machine? Otherwise my Mac Pro is in incredible running condition. Also I'm having to edit my Nikon D810 RAW files in Lighroom and would much rather use C1. Eleanor
10.9 is required. If you want to ease into it you can always install 10.9 on a separate partition or drive.
From a customer support point of view OS support is very tricky. Preferably you want to meet a customer where they are (ie not force them to make a change to the computer to use your stuff). On the other hand one of the largest challenges in v7 was they chose to support all the way back to 10.6, which caused nothing but headaches and significantly reduced their ability to optimize the speed and stability of the software.
With 10.10 being released soon, and with the cost of 10.9 being free, I think it's reasonable for them to require it.
Maybe you could borrow a friend/family computer with 10.9 and try v8 for a short bit; the improvements to speed, especially when working with large volumes of folders, is evident immediately. Or stop by our Photo Plus booth in NYC next month and play with it there.