Hi,
On a MacbookPro the latest Catalina is running. I like to have parallel on an external disk the former Mojave installed as alternate boot to use it for some 32 bit Applications.
I downloaded the installer App new but Catalina does not open the Mojave installer App.
It is too old.
I'm looking for some work around.
I have a Time Machine backup of Mojave from before I installed Catalina.
Thanks for any help
G.
MacBook Pro, OS X 10.10
Thank you very much. I did that, sInce I had such an USB Installer. I got stuck when the external device, I tried a new APFS partition, and a drive with Mac OS Extended ..., were not accepted as install device. They had no GUID partition. I could not figure out how to make with Disk Utility that partition.
G
After downloading Mojave again, this time on the latest Big Sur system, and creating again USB Installer I succeeded making a Mojave system on the APFS drive partition (part of a large WD drive). That worked as expected and I have not understood why it failed on y other Catalina MacBook Pro. I tried the same WD drive but with an older Installer (Catalina). I see a warning that the drive uses feature the Mojave system does not support.
Many thanks dialabrain I appreciate your input.
Are you trying to install Mojave on a partitioned drive or are you going to use the entire drive for Mojave? If partitioned, what's on the other partition and how is the drive formatted?
See: How to create a bootable installer for macOS - Apple Support
Once you create the above, you would boot from it, select your external drive, then install.
You're welcome. I can't tell from your reply if you need further help or if you've resolved the issue.
No, I haven't succeed. G
You're welcome.
Install older system on external disk
