Double click on the icon and follow the steps to update your computer.
Once it’s finished, you’ll find the update file on your desktop or in the Launchpad. Then just go to the Mac App Store, find macOS High Sierra, and start the download. If you don’t have that available, you may need to move some files off your computer or uninstall apps. Next, you’ll need about 5 GB of free space in storage for the upgrade. There are three ways to create a backup for your Apple computer: You can back your files up to another storage device (i.e., an external drive), upload your stuff to iCloud, or use Apple’s Time Machine app to create a disk image. This isn’t strictly necessary to have the upgrade work, but it’s great insurance against mishaps. First, any time you upgrade to a new operating system, it’s smart to first create a backup of your files. If you’re about to upgrade to macOS High Sierra, here’s some basic advice.
