The newly released update, macOS Catalina, is available to users who are running OS X 10.9 (Mavericks) or later on their Mac. MacOS 10.15 (Catalina) was released on 7 October 2019. There are several reasons why you might not want to disturb your current installation, whether it's Catalina or an older. After all, if you're upgrading to macOS Catalina, you want your Mac to boot to it all the time, don't you? Not necessarily. Now, the big question is why you don't want to install macOS Catalina on your main hard drive. Reading the FAQ on DosDude’s site I see it says: “AMD/ATI Radeon HD 5xxx and 6xxx series graphics acceleration: Currently, it is not possible to achieve full graphics acceleration under Catalina on any machines that use a Radeon HD 5xxx or 6xxx series GPU.”. How to Install MacOS Catalina on Unsupported Macs. If you’re still having problems downloading macOS Catalina, try to find the partially-downloaded macOS 10.15 files and a file named ‘Install macOS 10.15’ on your hard drive. Once in the Terminal, enter the following command and hit return/enter: You should see something like this: If your time and date are incorrect. While in the Recovery mode, cancel the installation process, and navigate to Utilities and open the Terminal app. Boot into macOS Recovery again by restarting your Mac and holding CMD + R keys together.
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