I have Mac OS X Yosemite version 10.10.5 My new printer requires a 10.11 or higher How or can I upgrade
I have Mac OS X Yosemite version 10.10.5 My new printer requires a 10.11 or higher How or can I upgrade?
iMac, OS X 10.10
Any machine that can run Yosemite can also run El Capitan. Which iMac model are we talking about?
Look at your software update to see if El Capitan is offered as a download. If your machine is old El Capitan will be the latest version it can upgrade to and the only one offered. If your machine is more recent the App Store will offer you the latest macOS compatible with it.
If the App Store does not offer you El Capitan and you want that particular macOS instead of a more recent one you can download an installer from this page:
How to download macOS - Apple Support (CA)