I have been updating the macOS from 10.12.4 to 10.12.6 . For this I have downloaded the macOS dmg file from the Apple website. But when I go on for installing the macOS then I see this error.
I have around 100GB of space but its still not updating the OS. What should I do about it. I need to install "Xcode" from the App Store but when I go on for installing it gives me the error that it needs the OS update to be 10.12.6 How can I fix this up?