Mac Os 10.11 Upgrade

If your Mac isn't supported still, you could still upgrade to OS X El Capitan. Download the update from the App Store. The Mac App Store is the best, and usually only, place to download macOS updates.
Learn which macOS your Mac is using and how to upgrade to the latest macOS. When your Mac is connected to a Personal Hotspot, large updates don't download automatically. Published Date: November 12, 2020.
The first version of Mac OS X was Mac OS X Server 1.0.Mac OS X Server 1.0 – 1.2v3 were based on Rhapsody, a hybrid of OPENSTEP from NeXT Computer and Mac OS 8.5.1.The GUI looked like a mixture of Mac OS 8's Platinum appearance with OPENSTEP's NeXT-based interface.

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Use Software Update

Choose System Preferences from the Apple menu , then click Software Update to check for updates.
If any updates are available, click the Update Now button to install them. Or click “More info” to see details about each update and select specific updates to install. You might be asked to enter your administrator password.
When Software Update says that your Mac is up to date, the installed version of macOS and all of its apps are also up to date. That includes Safari, Music, Photos, Books, Messages, Mail, Calendar, and FaceTime.
To automatically install future updates, including for apps that you got from the App Store, select “Automatically keep my Mac up to date.” Your Mac will notify you when updates require it to restart, so you can always choose to install those later.

Learn how to update your iPhone, iPad, or iPod touch to the latest version of iOS or iPadOS.

Learn how to get updates for earlier versions of macOS that don't include Software Update preferences.
You can also use the App Store to update apps or redownload apps that came from the App Store.
Learn which macOS your Mac is using and how to upgrade to the latest macOS.
When your Mac is connected to a Personal Hotspot, large updates don't download automatically.