Mavericks Upgrade To macOS Sierra

The download of High Sierra would probably take about an hour, and then the installation process would take about half an hour, so I doubt that High Sierra is installed, but let's check first.

Go to About This Mac and see what OS your Mac is running it will probably still be Mavericks. Next look in your Application folder for Install macOS High Sierra.app if you see it put it in the Trash and then empty the Trash.

If you still want to install Sierra then follow the link here, How to download macOS Sierra - Apple Support

Sierra is still available to download, How to download macOS Sierra - Apple Support

Sierra is no longer available from the App Store. If you had it in your account while it was available from Apple it is now replaced by High Sierra when you download.

High Sierra is identical with Sierra with some additional securities.

If your system is eligible to run Sierra it is also eligible to run High Sierra as well.

Good to know. Now check in the App Store to see if you have any updates available, especially Security Updates.

Check to make sure your applications are compatible.

Application Compatibility

macOS Sierra 10.12: Compatible Apps

Also check to make sure there is a compatible driver for your printer.

Do a backup before installing, preferable 2 backups on 2 different drives.

You are welcome.