So with the end of 32-bit App support, I was thinking maybe if I run across an app that I really need to run than will no long run post 10.15, that it might be a good idea to have an older version on a small partition for this purpose. I was personally due to my likening of that version of OSX thinking about trying to install 10.11 on a separate partition on my Mac. However I keep hearing that it’s not possible to install an older version of MacOS/OSX (in dual boot) while a newer one is installed, is this the case?
My Mac will happily run 10.11 as it did back when it was current so that’s not the issue. It’s rather can I just get an installer ready and plop it on a blank partition and then just select it in the bootmanger with 10.15 and Windows, or will it not install because of having 10.15 installed currently?