The App Store only shows updates for the OS you are using at the moment, in your case Yosemite 10.10.5. Apple air hard drive upgrade.
If you want to go to another newer OS that is called an upgrade. This can be done through the App Store using the following link.
The 27-inch model was updated with new 10th-generation Intel processors, a True Tone display, a $500 nano-texture glass option, and more on August 4, 2020. The 21.5-inch model switched from a 1 TB. 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.
High Sierra is the last/ newest OS your Mac can use. Scroll down to Section 4 and click on Get macOS High Sierra.
Make a full back up of your Mac before upgrading.
Check to see with the developers of any third party apps you use that there are updates available so they will continue to work in the new OS. Another thing you need to check is if any printers/ scanners etc you use have updated drivers and software so they too can continue to function in the new OS.
Feb 3, 2019 11:15 PM
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