![]() The correct steps to install macOS Mojave on your Mac running Catalina and later macOS are: erase your startup disk (Macintosh HD), c reate a bootable USB installer, and install the macOS Mojave onto your Mac. ![]() This should only be used if you're downloading macOS Catalina to use it on an. You are unable to directly install an older version of macOS on top of a newer one. In the file menu, go to Options and uncheck the option which says 'Auto-apply Post Install Patches'. Click the button to install, and when a window appears, click 'Continue' to begin the process.' Via the Software Update Preference Panel, one is downloading an update of the new Mac OS to the prior one. When the download of the macOS installer completes, it will open automatically, and if your current macOS is older than the downloaded one, just follow the instructions to install macOS, if not, quit the process here. Open up the App Store in your current version of macOS, then search for macOS Catalina. You should make sure there is enough disk space for the new macOS installer.īefore installing the downloaded macOS on your Mac, you'd better back up your Mac to avoid data loss. I’m currently running High Sierra 10.13. Is that normal I tried downloading multiple times with the same result. To note: The Install macOS Catalina I downloaded from the app store is not a full version of Catalina, it is only 19.1 MB. Given that Apple hides the entries of some previous macOS in Mac App Store, you can not download and install macOS Mojave/Catalina/Big Sur from Mac App Store. Then click Get to download macOS Mojave/Catalina/Big Sur on your Mac. /Applications/Install macOS Catalina.app does not appear to be a valid OS installer application. ![]() ![]() A window will pop up and ask Open App Store.app? Click the Open button to open Mac App Store where you can see the entry of the target macOS version. ![]()
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