Note that the upgrade will most likely convert the filesystem on your Mac, carefully read.' articles concerning ALL intermediate versions of macOS, in particular the warnings about 32bit applications! You should also read the 'About macOS.In case you migrate from a macOS version older than 10.15:

You will need to re-install your OS if this happens, data loss is quite likely. The installer will start even if you don't have enough free space, it will fail and stubbornly try again after a restart.

Make sure you have enough free disk space for the install image AND the installation process.

We recommnd to store all your data in cernbox. Make sure you have a recent backup, allowing you to recover your data in case of problems. Verify your hard-disk or SSD before doing the install. We expect that most uninstallers for outdated software will NOT WORK any more under macOS 11. Uninstall outdated software and all software you don't use any more BEFORE upgrading to macOS 11. We expect that many updaters of older software will NOT WORK any more under macOS 11. Make sure to update all third party software you are using BEFORE upgrading to macOS 11. See below for a list of known issues (be aware that the list is far from complete). There are some important actions to take before you install it:Įnsure that all the software you are using is compatible with macos 11. If your Mac still runs a macOS version below 10.15 you should upgrade to a supported version of macOS as soon as possible!įor an overview of new features in macOS 11 see MacOS 11 ('Big Sur') became available from the Mac App Store on November 12th, 2020.Īll macOS versions below 10.15 are now unsupported.

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