#MAC OS CATALINA DOWNGRADE HOW TO#
#MAC OS CATALINA DOWNGRADE 64 BIT#
#MAC OS CATALINA DOWNGRADE UPGRADE#

You do this by right-clicking the Mojave installer app located in the 'Applications' folder and select 'Show Contents'. If using the official Apple instructions doesn't work correctly or you cannot finish installing Mojave, then you need to copy the 'BaseSystem.dmg' file from within the Mojave installer app. Once you have the Mojave installer you can try creating a bootable Mojave USB installer using these instructions: You may need to do this from another Mac since Catalina does block the ability to download older versions of macOS from the App Store. If you want to reinstall Mojave, then download the Mojave installer from the App Store. This is one of the few macOS installers that actually works. dmg file which will just copy the El Capitan installer to the 'Applications' folder so that you can use these instructions to create a bootable macOS El Capitan USB installer. Run the El Capitan 'installer' from the mounted. This is a new El Capitan installer which can be downloaded outside of the App Store so you can acquire it from a Windows/Linux PC and transfer it your Mac.

How did you create the bootable El Capitan drive? You can create a bootable macOS USB El Capitan drive by downloading the installer from the link on this page:

#MAC OS CATALINA DOWNGRADE HOW TO#

Can you provide step by step instructions on how to wipe my physical drive and re-install my OS? I appreciate your help! This is a little outside of my wheelhouse. I need my original operating system that came with my computer. I do have a bootable drive for El Capitan but it won't work, I get a ban sign. Painterz unfortunately Mountain Lion is not listed in the OS bootable drives. how does one erase the physical drive? I thought that's what I was doing when I unfortunately Mountain Lion is not listed in the OS bootable drives. Unfortunately, I don't know which backup was pre-Catalina and that was a month ago so I don't want to lose my work.

I believe Catalina has caused this because I did backup before installing Catalina without problems. I renamed the drive by adding a '1' at the end so I'm not sure what I backed up. I thought that was odd but I don't remember where I was. I was in one of the apps, prior to the backup, and I did see two HD-Datas. For some reason Time Machine kept saying I had two drives with the same name, which I don't. Thanks and HWTech, I thought I saw Mountain Lion as an option in Recovery Mode when I upgraded to Mohave. I see that I can purchase it for $19.99 but since I already had it, in my mind I shouldn't have to purchase it again.

From what I've read I need to wipe my computer and start over and that means I need a bootable drive with Mountain Lion OS. So now I would like to ditch Catalina and go back to Mohave. I've turned off my computer being able to sleep but still have to restart my computer when it's been inactive for a while.

#MAC OS CATALINA DOWNGRADE UPGRADE#

Then I accepted the upgrade 10.15.1 and that's when my problems started.

#MAC OS CATALINA DOWNGRADE 64 BIT#

I upgraded to Catalina (not realizing it was a 64 bit system and lost communications with my scanner) and my glitches went away. I upgraded to Mohave for compatibility issues with websites but my computer was a little glitchy. I have replaced the HD with an SSD (set TRIM to yes), expanded the memory to 16 gb, and replaced the battery.

Mac os catalina downgrade