Adobe master collection CS5.5: I purchased the original MAC OS dvds a few years ago. I need to reinstall my OS as I mistakenly deleted a wall working older Adobe programs I had due to space constraints. I'd like to remain with Sierra 10.12 but am afraid that if I reinstall, the apps won't activate. Any tips and suggestions? Do I need to go to an earlier OS? I'm not concerned about whether there is support. I just want it to run. It has been registered with Adobe, but I've never installed or activated the CS 5.5 mastersuite yet. And Adobe won't apparently offer any CS support or suggestions. Where should I start and with which OS?