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I realized today that the Catalina OS doesn't support 32-bit games anymore and I still want to play Portal. On the Steam website they suggest to create an APFS new partition and install Mojave on it.
The problem is that the IntallMojave program cannot be launch on Catalina as it is :
This copy of the "Intaller macOs" application is too old to be opened under this version of macOS.
How can I have the two version on my computer to continue play old games?
Pierrick Rambaud
Posted 2020-02-10T15:50:13.997
Reputation: 101