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You can download and install macOS High Sierra OS for free in 2009 or later. Can I upgrade my 2009 iMac to High Sierra? – One of the updates is macOS High Sierra.

– Fin the last tab in the top menu, Updates. – Make sure you have a fast and stable WiFi connection. – Click Continue and then select Startup Disk (where OS is located) – At the macOS Utiities screen press Disk Utility. – Restart your Mac in Recovery Mode: press Command + R while you reboot. – 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. – If any updates are available, click the Update Now button to install them. – Choose System Preferences from the Apple menu , then click Software Update to check for updates. How do I update my Mac when it says no updates available? You can upgrade directly from Snow Leopard to any newer version of OS X, including the current El Capitan, and the Mac App Store is the main delivery method for those upgrades. If your computer’s last OS option isn’t El Capitan, read on. Once upgraded to El Capitan or later, you can then run Migration Assistant to transfer data to Catalina or Big Sur. (No Macs that can run Snow Leopard can be upgraded to Catalina or Big Sur, which would solve the problem, too.). Can I upgrade from Snow Leopard to Catalina? – Click Continue and follow the on-screen instructions. – Once download is complete, installation for macOS Sierra begins automatically.

– Click the Download link on the updates tab to download macOS Sierra. – Open the App Store and click on Updates tab. How do I upgrade my macOS from Snow Leopard to High Sierra? Once download is complete, installation for macOS Sierra begins automatically. This download will take 1-2 hours depending on the Internet speed. Click the Download link on the updates tab to download macOS Sierra. Open the App Store and click on Updates tab. How do I upgrade my Mac from 10.6 8 to Sierra? You will have to first upgrade to El Capitan, then to High Sierra. 8) or Lion (10.7) and your Mac supports macOS High Sierra, you will need to upgrade to El Capitan first. Can I upgrade from Snow Leopard to High Sierra?