Know that you’re not alone – the macOS Mojave install error has happened to a number of users, and it doesn’t take a lot for them to realize that the problem is likely related to the OSInstallerSetup and the whole process of migrating to Mojave in general. The show ends with the spinning beach ball of death appearing, staying for a few minutes. In another case, you might find that your MacBook suddenly becomes unresponsive after installing Mojave, taking so much time performing otherwise simple tasks. Encountering the “An error occurred installing macOS” message during the macOS Mojave update can be frustrating.
