- Open the disk image, then open the.pkg installer inside the disk image. It installs an app named Install Version Name. Open that app from your Applications folder to begin installing the operating system. MacOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion, or Lion.
- What's new in OS X 10.8.5 Supplemental Update. Resolves an issue that may prevent certain applications from using the FaceTime HD camera on mid-2013 MacBook Air systems. Fixes an issues that may cause external drives to be ejected after the computers goes to sleep. Addresses an issue that may prevent HDMI audio from working after waking from sleep.
macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.
macOS Big Sur is compatible with the following computers. If your Mac isn't compatible, you might be able to install an old version of macOS instead.
MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.
He has Mac OS X version 10.5.8. When we tried to upgrade it the OS reported that there are no updates available. We googled around to find alternative ways of upgrading the system - 3-4 different clicking paths all leading to the same system update program - but with same outcome. Official OS X Mountain Lion.app Installer from the Mac App Store.Both versions 10.8.4 AND 10.8.5 full installers included (zipped).Un-archive the zip archive.
If upgrading from macOS Sierra or later, your Mac needs 35.5GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.
Update Mac 10.8 To 10.10
Download macOS Big Sur
If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu > System Preferences, then click Software Update.
Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.
Install macOS Big Sur
After downloading, the installer opens automatically. Click Continue and follow the onscreen instructions.
Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, it might restart and show a progress bar or blank screen several times. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.
Stay up to date
Update Macos 10.8.5
After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. To check for updates, choose Apple menu > System Preferences, then click Software Update.