See also: How To Know If Your Mac Is Started In Safe Mode Note: Your Mac will be shutdown in the middle of these steps, so either print, write down or follow these instructions from your phone.
The solution for users running macOS Mohave is to download and install the macOS Mohave 10.14.6 supplemental update.
In addition to problems with the App Store, the September update has caused user’s machines to slow down and Safari to stop working. Special note for users who are running macOS Mohave: There was a security update in September 2020 which is known to be buggy.
You may also receive various error messages when you attempt to update your apps on your Mac. Although the update information for the app shows in the App Store, when the update button is clicked, the app does not get updated and the app update still shows in the App Store.