Install of macos sierra
I trying to install macos sierra but not install
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Have you downloaded the InstallOS.dmg from here,
How to upgrade to macOS Sierra - Apple Support
At Section 4 click on Get macOS Sierra
this will download InstallOS.dmg to your Downloads folder.
Open the InstallOS.dmg to get InstallOS.pkg.
Double-click on InstallOS.pkg and an installation window will
open. This does not install macOS Sierra but creates the
Install macOS Sierra.app in your Applications folder.
You can then use Install macOS Sierra.app to install macOS Sierra.