If your running an older Mac its important to update the mac with the latest patch’s and Versions. Apple Provide these Updates free as long as your mac can support the update.
- Make sure that you’re on a trusted network such as your home or work connection.
- Back up your Mac using Time Machine or another backup system. (But if you don’t have access to these, it’s more important to perform the upgrade, even without a backup. You could just save cricital files to external storage as a half measure.)
- Make sure your Mac is plugged in if it’s a laptop.
- Tap the Apple icon at the top left of your Mac’s main menu bar, and choose “Software Update…”
- The Mac App Store will open, showing you available updates. You’ll have to agree to an Apple user license agreement. If other updates are offered, run those as well as the OS X updates. (Another option is to download Apple’s manual installer).
- Do not interrupt the update by unplugging or restarting the computer. It will show a progress bar for several minutes; On my MacBook Air it took just 12 minutes.
- You’ll be asked to enter your Apple ID and password to verify iCloud and Keychain options.
You will then have to download the updates and carry out the install. Depending on the amount of updates you have this may take some time, so if you have anything important to do. Do this before you do the update.
All going well you should then be on the latest Mac Version.