i have iMac 27 mid 2010, os x yosemite 10.10.5 how can i upgrade, i can't synch my iPhone
I have IMac 27 mid 2010 OS X Yosemite 10.10.5, I can't synch my iPhone, need to upgrade software ??
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Your mid 2010 iMac can only upgrade as far as macOS High Sierra 10.13.
Open Safari and click on this link,
How to get old versions of macOS – Apple Support
Go to the Download OS section and click on macOS High Sierra.
Before upgrading make a full back up of your Mac.
Check that third party apps you use have updates available for the new OS.
Check that your printers/ scanners etc have updated drivers and software available for the new OS.
Connect your mac to your router via cable rather than rely on WiFi.
Do not use your mac while it is downloading
and do not use any other devices that share the same internet connection.
If the App Store says ‘Open’ then it is detecting a previous download of the install app
go to the Applications folder locate Install macOS High Sierra.app.
Move it to the Trash, empty the Trash.
Restart, click on the link again, the App Store should say ‘Get' or 'Download'.