I checked the update info before I downloaded it and I didn't see anything it about it not working on 10.6.8. It was pretty disappointing to see the new PLEX application with a slashed circle. I'm only saying to at least give a warning beforehand so people running 10.6.8 don't download and try to install it.
I downloaded the new update and then the updater crashed. Why? Because the new PLEX Media Server application doesn't run on Snow Leopard 10.6.8. I had to look around for a backup PMS 0.9.16.6 application which is now apparently the last version of PMS to run on Snow Leopard. I'm in the unfortunate position that my iMac isn't upgradeable to a newer OS at this point as I don't have enough disk space to allow it to update. I can theoretically move my entire PMS database and Media Drive to my MacMini running El Capitan but I really don't want to be bothered right now. I'm not complaining about you leaving older Mac OSes behind. I'm only asking for a warning beforehand.