6. Make time and space
The installation files for High Sierra
take up around 5GB of space. The time it takes to download will vary depending on your connection speed. See our guide below for tips on how to check your available storage space and free up some clutter. Once you’ve begun downloading the installer via the Mac App Store, you can keep on using your Mac as normal. Once the download is complete, the installer will open. You can choose to start the process at any time but remember you won’t be able to use your Mac during installation.