Catalina Back To Mojave

Feb 05, 2021 If you're using OS X El Capitan v10.11.5 or later and your App Store preferences or Software Update preferences are set to download new updates when available, macOS Big Sur will download conveniently in the background, making it even easier to upgrade. How to Run 32-Bit Apps in macOS Catalina. Apple's latest version of macOS, Catalina, officially ditches 32-bit app support, but you can still run the software you need by following these steps. May 26, 2020 From the desert to the coast: macOS Mojave has given way to the next major version of the Mac operating system, called macOS Catalina.Revealed during Apple’s 2019 WWDC keynote in June, Catalina.

Downgrade Catalina to Mojave

If you’ve installed macOS Catalina and run into problems with some of your apps, or you’ve just decided that you don’t like it as much as Mojave, the good news is that you can downgrade back to the previous version of macOS. The bad news is that it’s a lengthy process with several steps. Read on to find out how to do it.

1. Back up your Mac

You should have backed up your Mac before you upgraded to Catalina, as you should before you perform any major upgrade or make any significant change to your Mac. However, the files you’ve been working on since you upgraded won’t be up to date on that backup. So, you should copy those files to an external disk, or a cloud storage service like Dropbox or iCloud Drive so you can retrieve them easily when you downgrade. We’re going to completely erase your Mac’s startup disk, so it’s important to copy anything you need now.

Before you backup, however, you should take steps to remove the junk and clutter from your Mac. There’s no point in backing up all the clutter along with the files you really need. To do that, I recommend CleanMyMac X. It’s the easiest way to clear out the clutter on your Mac. Here are just a few things it can do:

  • Delete years worth of system junk
  • Find hidden apps and folders
  • Neutralize Mac-specific malware, like key loggers
  • Manage hung apps and heavy CPU consumers
  • Update all your software to the latest-supported versions

As you can see, CleanMyMac X does a lot more than just clear out junk files before you backup your Mac. It’s well-worth keeping it on your Mac and using regularly to keep your Mac running smoothly.

2. Save your passwords

When you downgrade mac OS Catalina, you’ll delete everything from your hard drive, including licence keys and settings. So, in addition to making sure you copy all the files that have changed since you last backed up, you should make a note of those. If you use a password manager that syncs with other devices and allows you to store licence codes and encrypted notes, you could use that. If not, any app that allows you to sync encrypted notes will do. Or you can use Apple’s Notes app. It’s also a good idea to take screen grabs of settings to make it easier to restore them later. Remember to copy the grabs to a cloud storage service or an external disk.

3. Create a bootable installer of macOS Mojave

Note, you can skip this step if your Mac shipped with macOS Mojave or if you made a backup with Time Machine before you upgraded to Catalina.

  1. If you’re reading this before macOS Catalina ships, you can go to the App Store and search for Mojave, then download it. If it tries to install when it’s finished downloading, quite the installer.
  2. If you’re reading this after Catalina ships, you can download Mojave ‎here, but only on a Mac that’s not already running Mojave. When you click that link, Software Update will launch and start to download Mojave. When it’s finished, quit Software Update.
  3. Grab a USB stick with 16GB capacity or an external hard drive or SSD and plug it in to your Mac.
  4. Launch Disk Utilities and Erase the Drive or USB stick, formatting it as Mac OS Extended (Journaled) and selecting GUID partition map if a selection is available.
  5. The easiest way to create a bootable installer is to use DiskMaker X. However, you can also do it in Terminal like this:

Macbook Catalina Back To Mojave

  • Launch Terminal from Applications - Utilities
  • Type: sudo /Applications/Install macOS Mojave.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled where ‘Untitled’ is the name of your USB stick or external hard drive
  • Press Return and wait for the word Done to appear in Terminal.

Whichever method you used, you should now have a bootable macOS Mojave installer. Keep it safe.

4. Uninstall macOS Catalina

  1. Make sure your Mac is connected to the internet.
  2. Click on the Apple menu and choose Restart.
  3. Hold down Command+R to boot into Recovery mode.
  4. Choose Disk Utility in the macOS Utilities window
  5. Select your startup disk
  6. Choose Erase
  7. Quit Disk Utility

How to downgrade Catalina to Mojave if your Mac shipped with Mojave

  1. Once you’ve erased your startup disk and quit Disk Utility as described above, choose Reinstall macOS from macOS Utilities.
  2. Press Continue.
How

How to rollback from Catalina using a Time Machine backup

Mojave

No disk available to install mac os x. If you backed up your Mac with Time Machine before you installed Catalina, you don’t need to create a bootable installer – you can just reinstall Mojave from your Time Machine backup. Make sure it’s plugged in if it’s an external disk. If it’s a network disk, make sure you’re connected to the network.

  • Once you’ve erased your start up disk as described above, choose Restore from Time Machine backup in the macOS Utilities window.
  • If your backup is on an external disk, select it. If it’s on a network disk, select it and choose Connect to Remote Disk.
  • Type in your username and password for the remote disk if necessary.
  • Select the data and time of the backup you want to restore from.
  • Follow the onscreen instructions.

5. Install Mojave using a bootable installer

If you have a Mac that didn’t ship with Mojave and you don’t use Time Machine to backup, you’ll need to reinstall Mojave from the bootable installer we created earlier.

  1. Plug in the installer disk.
  2. Go to the Apple menu and choose restart, then hold down the Option key.
  3. Mojave will start installing on your Mac.
  4. When it’s finished, your Mac will restart and the Setup Assistant will appear
  5. Follow the steps in the SetUp Assistant to set up Mojave

Restore your settings

If you have reinstalled Mojave from a bootable disk, rather than a Time Machine backup, you will need to reinstall applications and copy documents across from your backup. That’s where those notes and screen shots you made earlier come in handy!

Once you’ve restored your settings and reinstalled all the apps you need, your Mac is ready to use again, running Mojave instead of Catalina.

Tip: If you want to roll back to an earlier version of macOS than Mojave, you can. To reinstall the OS your Mac shipped with, use the method in ‘How to downgrade if your Mac shipped with Mojave’. If you want to roll back to a version of macOS newer than the one your Mac shipped with but older than Mojave, you can download Sierra and earlier versions from the Mac App Store. Then follow from Step 3 in ‘Create a bootable installer of Mojave’.

My Mac is still underperforming, what to do?

You thought that reverting to macOS Mojave would get your Mac back to norm. But if it didn’t and you still experiencing sudden freeze-ups and glitches, full disk cleanup is your answer. Probably there are too many conflicting system junk files on your drive that you need to plow through.

You don’t need a regular disk cleanup app — most of them are scam — but this tool, CleanMyMac X, is notarized by Apple, and can really do helpful optimizations on your Mac.

  • Download the free edition here
  • Go to Maintenance tab


Now you can perform some of the tasks suggested by the app, like running Maintenance Scripts. Also, check the System Junk tab and remove all the useless files it recommends you to delete.

As you can see, it is possible to uninstall Catalina if you decide you don’t want to continue using it. It’s essential, however, that you backup your Mac before you upgrade. And remember, before you backup, clear out the clutter with CleanMyMac X. That way you won’t use precious space on your backup drive copying over junk files.

on VMware ESXi 6.7 U3 P02


** UPDATE 12/03/2020**

This now installs natively on ESXi 6.7 Update 3 Patch 02 - 202004002
I followed my same procedure below after downloading Catalina and Big Sur.
** I increased the image sise to 13GB as Some Catalina versions were greater than 8GB and Big Sur is 12.9GB
hdiutil create -o /tmp/catalina -size 13000m -layout SPUD -fs HFS+J
hdiutil attach /tmp/catalina.dmg -noverify -mountpoint /Volumes/install_build
/Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build
hdiutil convert /tmp/catalina.dmg -format UDTO -o ~/Downloads/catalina
mv ~/Downloads/catalina.cdr ~/Downloads/catalina.iso
Next, I copy the ISO to a external system (my desktop) an a network drive where I will install from.
In VMware (I am using vCenter)
Name it, I use macos-catalina
Pick a folder, Pick a Server/resource Pool and Pick Storage
For Compatibility, click the dropdown and select ESXi 6.7 Update 2 and later
For Select OS, click the Gueast OS Family drop down and select Other
For Guest OS Version, click the dropdown and select Apple macOS 10.14 (64-bit)
Under the datastore, I choose Disk Provisioning Thin Provision
Finish and save the VM
To install, I open a remote console on the VM
Select VMRC - > Removable Devices -> CD/DVD Drive1 -> Connect to Disk Image File (ISO)
In the OS boot menu, select SATA CD/DVROM, then boot to the installer
Select the VMware Virtual Disk
Give the disk a name
Start the macOS installer and complete the install steps. This takes about 45 minutes total.
Once installed, disconnect the ISO from the console client.
Reboot one last time to make sure it still boots OK.


** UPDATE 04/15/2020**
Seems you need to start at Mojave to be able to download the full Catalina package from the App Store. I started from Mojave so I never ran into the issues found in the comments. Check the comments for what Adam had to say..
** UPDATE 10/17/2019**
After applying the first update, the VM was rendered un-bootable again. That is the same crash that is originally experienced. SEE Boot Work Around at the bottom.
This exercise was to get a running MacOS Catalina VM instance running on VMware. I first wrote this for Catalina Beta but afte rthe official release, a couple things changed. So now it is how to install Catalina on ESXi 6.7.
I am using a 2013 Mac Pro with VMWare 6.7 U2 installed. I have High Sierra and Mojave VMs running on the host. Running VMs on VMware is something I've done for a few years.
A lot has changed in Catalina. Admittedly, I am not a MacOS expert. I'm not particularly good a Mac user either. So, I can't speak to the changes only that it is not currently (Oct 1, 2019) frienld to install on VMware ESXi. Catalina runs fine once you get a working VM though.

The MacOS Part

As of this writing (10/10/2019), You cannot upgrade and existing VM running High Sierra or Mojave. At least, I could not successfully upgrade and boot to Catalina.

If at first You Don't Succeed..

Note: You need to start at Mojave to upgrade to download the fill Catalina package.
I started with trying to upgrade a Mojave VM to Catalina. I just downloaded Catalina from the Apple Store (Search: macos catalina).
I followed the prompts and downloaded the Catalina installation image. I ran though the installation process which seemed to go pretty well. That is until it booted from the upgraded image. Then, it crashed. You can't see the crash, you just has an frozen Apple logo.

To see what is happening, reboot the VM and hold down the Windows Key + v for Verbose mode and see the boot attempt and the kernel panic. Changing VMware setting had no affect. After a couple hours, I gave up.

Try Something Else.. And It Worked!

My next tack was to boot from a Catalina ISO. First, I had to create one. I'd done this before on Mojave so it wasn't all unfamiliar. The steps are below. I am not sure where they came from.
First, I had to boot back to Mojave. I had found by rebooting the VM to the Boot Manager settings (you can set this in the VM settings or press escape before the OS loads in a VM console) and Selecting the EFI VMware Virtual SATA Hard Drive (0,0) option (not Mac OS X), that boots to my original Mojave image.
To start from scratch on a Mojave instance, download Catalina from the app store (Search: macos catalina). Just don't run the installer. You need the app image to create the ISO.
Once Mojave loaded, to build the ISO file, I start by making the virtual disk:
hdiutil create -o /tmp/catalina -size 13000m -layout SPUD -fs HFS+J
Then, I mount it to I can copy the installer to it
hdiutil attach /tmp/catalina.dmg -noverify -mountpoint /Volumes/install_build
Now I copy the installer to the mounted image
sudo /Applications/Install macOS Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build
The image is automatically mounted and is on your desktop. Select it and un-mount the image.
Now convert the image to an ISO file. You can put the file anywhere but I used ~/Downloads for simplicity
hdiutil convert /tmp/catalina.dmg -format UDTO -o ~/Downloads/catalina
Now rename the file from catalina.cdr to catalina.iso
mv ~/Downloads/catalina.cdr ~/Downloads/catalina.iso
You can delete /tmp/catalina.dmg.
Copy the ISO to your PC or where ever you want to attach it to the VM via a console session. I use WinSCP to copy to my PC.

The VMware Part

I created a blank VM with the following settings:
These are important. Just follow my lead here.

Catalina Os Back To Mojave


Guest OS Version: Apple macOS 10.14 64-bit
4GB Memory
The rest is default

Once the VM is saved, edit the settings and change to
Guest OS: Windows
Guest OS Version: Windows 10 64-bit
Changed to Windows 10

Next..
Open a Remote Console (VMRC)
Click VMRC --> Removeable Devices --> CD/DVD --> Connect to Disk Image File
Navigate to the catalina.iso file you saved where ever, Click Open
Attach ISO
Now ALT+CTRL+Insert in the VM to reboot it. It will boot from the ISO automatically. If not select the SATA CDROM frm the EFI menu. Note, sometimes it took several reboots for it to successfully boot from the ISO. usually, just one.

Once the installer image loads, use the disk tool to erase the VMware virtual disk (100GB in my case)
Use the default erase options (Note: Your keyboard doesn't work so just accept 'Untitled')



Next, choose to install MacOS
Follow the install steps and install Catalina

Once the install finishes, it will reboot to the OS. Make sure you detach the ISO so you don't boot to the installer again.
Reset the VM
The VM should boot to the image and continue installing Catalina. When it finishes (10 or so minutes) it will reboot.


After the reboot, it will freeze on the blank Apple logo or unsuccessfully load MacOS X. Don't fret. We're OK.
Power off the VM
Edit the VM setting and change the OS values.
Guest OS Version: Apple macOS 10.14 64-bit

Power on the VM and it will boot to and load Catalina.
Once you go through the setup steps and Catalina is ready to go.

Good luck on your adventure!

Added 10/17/2019
After applying the update, the VM was no longer booting. Same cast at boot with the Apple Logo and no progress.
the work around is to change the boot order in EFI boot settings to boot to SATA Hard Drive 0.0
You need to enter EFI boot configuration for the VM. You can hit escape a the VMware logo or go to the VM settings and set to boor to EFI next boot. Boot/reboot to get the EFI menu

Enter Setup
Configure Boot Options

How To Go From Catalina Back To Mojave

Change Boot Order
Press Enter then change the boot order in the pop up window using + and - keys. Press Escape when done editing.
Move EFI Virtual SATA Hard Drive (0.0) to the Top
You can see I change the overall boot order to:
Hard Drive

How To Go From Catalina Back To Mojave

CDROM
Mac OS X
Press Enter to Commit changes and exit



Catalina Beta Back To Mojave