now System Preference’s Software Update window will open with a pulldown window asking you if you are sure you want to download macOS Mojave (since you are running from macOS Catalina even macOS knows that normally doesn’t make sense) click the Download button.the AppStore.app will now automatically open on your Mac on the right page.

search online for the official macOS 10.14 Mojave installer on iTunes / the App Store, or use this link to download :.

So your best option at this moment is to create a virtual machine on your Mac (hoping you have enough internal disk space available – even though you might be able to pull the trick with 16GB free memory, you should be better off with at least 32GB of free memory before you try this).įirst, get yourself an official copy of the macOS 10.14 Mojave installer : In any version of macOS before 10.15 Catalina, the easiest alternative would probably have been to create a bootable external USB drive running an older version of macOS (like 10.14 Mojave), but by installing 10.15 Catalina you have also installed some drastic security which prevents your Mac from booting from an external drive easily… The easiest option is to find a Mac that still runs one of the latest versions of the 32-bit supporting versions of macOS like 10.13 High_Sierra or 10.14 Mojave.

But that’s 32-bit software, so it won’t run in macOS 10.15 Catalina… I have just upgraded to macOS 10.15 Catalina, but I just found out that I still have an old iPhoto database somewhere that I want to integrate with Photos.app using the official Apple iPhoto Updater application.

Macos virtualbox catalina