Upgrading LR AND OSX
I'm an off and on hobbyist user of LR and am currently running LR 5.2. I run it on an iMac running OSX Yosemite and am considering an upgrade to at least Sierra. I know I would have to get LR 6 in order to do this but wondered if there are many practical and/or significant differences between LR 5 and 6. If I choose to stay with LR5, what's the latest OSX version that 5 runs on?
Thanks for any input.