There was a folder called ‘MacOS Install Data’ that needed to be deleted. If you have permission issues boot into recovery (⌘R), select terminal from the menu bar, type ‘csrutil disable’. Reboot, delete folder, reboot back into recovery mode, access terminal again type ‘csrutil enable’ to renable protection and done.

Can I delete macOS Install Data folder?

So should i trash /Library/Updates folder and macOS Install Data in root too?? Yes you can definitely nuke the contents of these folders.

Can I delete Mac OS installer?

If you only want to delete the installer, you can select it from the Trash, then right-click the icon to reveal the Delete Immediately… option for just that file. Alternatively, your Mac can delete the macOS installer on its own if it determines that your hard drive doesn’t have enough free space.