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Updating my mac
iMac 21.5", OS X 10.11
If your computer doesn't meet the requirements for Mojave that are in that article, see if High Sierra will work.
Check to make sure your applications are compatible.
Also check to make sure there is a compatible driver for your printer.
Do a backup before installing, preferable 2 backups on 2 different drives.
It depends on the specs of your Mac.
macOS - How to Upgrade - Apple
Check in Apple menu > About this Mac for the year of your iMac.
I want to update my mac from 10.11.6 version
