how can I update my macOS
Im not able to download apps due to older version
Earlier Mac models
Question marked as
How old is your Mac? First go to the apple logo in menu bar>about this Mac to see your Mac model. It depends on your model to see if your Mac is still eligible to receive updates
If your Mac is new enough, go to either the app store> software update (older macOS versions) or system preferences>software update to see if there are any updates