mac os 10.10 5?

Is OS X Yosemite (10.10) a usable version of macOS in 2020?

You need macOS 10 if you do not see a “Software Update” option in the System Preferences window. It must have been installed before version 13. The Mac App Store is where you can download operating system updates. Click on the “Updates” tab in the App Store once you have launched it from the dock.

OS X Yosemite 10.10.5 App Store Downloading Guide

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