What can I do to update my Mac? My Mac isn't letting me update to the new macOS Catalina. It is telling me that the copy of the macOS Catalina is damage and cannot be updates due to this issue.
Delete the installer "Install macOS Catalina" from the Applications folder then try again while in Safe Mode.
Use safe mode to isolate issues with your Mac - Apple Support
Delete the installer "Install macOS Catalina" from the Applications folder then try again while in Safe Mode.
Use safe mode to isolate issues with your Mac - Apple Support
my Mac is not letting me update it to the newest update of itunes
