iMac early 2009 options
I have an early 2009 iMac and want to know what are my OS Yosemite or better options for upgrading. I am currently running version 10.10.5
iMac, OS X 10.10
The highest OS version that model will run is macOS 10.11 "El Capitan."
The link to get El Capitan is in this Apple support article:
How to upgrade to OS X El Capitan - Apple Support
NOTE: There are reports suggesting that FireFox may not download the installer. You need to use Safari if possible