I had a quick question. Before taking a crack a this -- I'm prepared to try and fail miserably as I have prepared FOUR identical backup discs with my main system on it -- I wanted to know whether it's possible to upgrade Catalina to an existing system rather than doing a complete vanilla install.
Right now, I'm using High Sierra in my 5,1 MacPro and I would like to upgrade my current system to Catalina without starting over. Is it possible to simply upgrade a drive with Mojave on it to Catalina or must it be an entirely empty disk?
In Step 1, for disk set-up, it says the following:
Disk A | Disk B |
---|
Newly formatted APFS volume (GUID scheme) | Existing Mojave installation (with working recovery) |
This is where OpenCore and Catalina will go | This is where the configuration will take place |
Now can I simply have a carbon copy of my main system as disc A so long as it is an APFS volume? Or is it necessary that the disc be erased/empty.
Does this installation procedure only work on 100% clean installs or can I upgrade a system from Mojave to Catalina? Thanks in advance.