
Hence, this is an indirect way to upgrade to Mojave from High Serria.
#Mac os mojave cleaner install
You need to create a bootable macOS Mojave USB drive first and use it to install Mojave on your Mac. If you can not get in your Mac or you prefer to do a clean install, then the direct upgrade is not suitable. However, it is not always working as expected and you may see error like the following one: This method is much easier so most people use this way to upgrade to a higher version of macOS once that is no longer the latest version.

Step 1: The first step whenever you install a new OS version is to take a back up of your data, so you can do that now via Time Machine on an external drive. This is the official way to upgrade macOS from old version to a new version.

Since the first release of macOS, Mac users can directly upgrade to a new version via macOS installer app, which you can get from App Store. Method 1: Direct Upgrade from macOS High Sierra to macOS Mojave
