The App Store only shows updates for the OS you are using at the moment, in your case Yosemite 10.10.5.

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.

Oct 24, 2019  After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install OS X Yosemite. Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed. Allow installation to complete. Keep the installer from being deleted. Like all recent versions of OS X, Yosemite is distributed through the Mac App Store. As with the Mavericks installer, if you leave the Yosemite beta. Aug 06, 2019  Download Mac OS X Yosemite 10.10.3 DMG for Mac full version. It is the best application for the reliability and security of your system. Many other websites are postulating to provide the facility of downloading free software but their link usually does not work.

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.

Omnigraffle For Mac Os X Yosemite 10 10 5

Feb 3, 2019 11:15 PM