Apple - macOS Sierra is downloaded but can't install

Did you look in your applications folder? Usually it downloads there. If you open your Applications folder there's an app called Install macOS Sierra

Found at: https://www.reddit.com/r/applehelp/comments/53qqnp/macos_sierra_downloaded_but_not_installed/

Yes I had the same issue go to applications and click the file that was downloaed. It is working now as in the past it froze on me.