Just as Apple regularly updates its i OS mobile operating system, the company also periodically updates its OS X operating system for its Mac computers.
If you own an i Mac, Mac mini, Mac Book, Mac Book Pro, Mac Book Air, Mac Pro, or Xserve, regularly updating your computer with the newest operating system is a great way to ensure that your device always has the latest apps, features, and security enhancements.
Before you actually do that, read this tutorial and follow the right steps to install and upgrade your i Mac or Mac Book to the latest Mac OS version.
Before rushing into anything, you should make sure that your i Mac, Mac Book Air, Mac Book Pro, Mac Mini, Mac Pro supports the latest version of Mac OS.
From here you must determine what your model can support - Mavericks or Lion: Upgrading from Snow Leopard to Lion or Mavericks To upgrade to Mavericks you must have Snow Leopard 10.6.8, Lion, or Mountain Lion installed.
Therefore, before installing mac OS High Sierra on your Mac, check your Mac storage before the upgrade.
RAM You need 2GB RAM to run High Sierra, which won't be a problem since all supported Mac models have at least 4GB RAM.
Here is the list of Mac models that are compatible with mac OS High Sierra.
Also, your Mac is required to run on OS X 10.8 or later.