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With macOS Catalina, Apple has changed the way you used to download the installer.

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If you rely on old apps that needs an update for the new platform, you might want to hold your upgrade until these apps are updated or you find alternatives.

The change that could affect it the most is the support for 32-bit apps being officially dropped. Whether you should upgrade your Macs to the new macOS Catalina is entirely up to your current workflow. Other notable changes include the abandonment of 32-bit apps in favour of 64-bit apps, refreshed Reminders, Photos, Mail, Safari, and Notes apps, and the introduction of Apple Arcade among others.

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It also officially kills the 20-year-old iTunes (on Mac) and brings separate apps to manage music and podcasts while also adding a new TV app. The update, named macOS Catalina, brings a bucket-full of new features including the ability of using iPad as an external screen for Mac. Hopefully this helps someone! If you have non-T2 chip Macs that ever need re-imaging, and you happen to already have access to a DeployStudio server, it’s a no brainer.Apple has just released the latest update to macOS. Remember that you must select “First Disk Available” when deploying an APFS image in DeployStudio in order for it to work correctly. AutoDMG will create an image that you can copy to your DeployStudio repository and deploy to your Macs. Open AutoDMG and drag the macOS Catalina installer app from the disk image onto AutoDMG (like usual).

After the disk image is created, mount the disk image.

For some strange reason, this is what will resolve the error that AutoDMG throws up when trying to create a deployable Catalina disk image. This will begin a process which creates a disk image with the macOS Catalina Installer on it. Select the folder that the macOS Catalina installer is in (not the installer itself) and click Save. You can change the Image Format from Compressed to Read-Only.

Open the Disk Utility application and navigate to Menu Bar > File > New Image > Image from Folder… I suggest not compressing the disk image, as I have had compression cause issues with mounting/cloning/copying in the past.

Create a new folder (anywhere, probably easiest just in your Downloads folder) and place the Catalina installer inside of the folder.

The macOS Catalina Installer app should now be present in your ~/Downloads folder.

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Once you have downloaded a full macOS Catalina Installer app, you can quit the Patcher Tool. If you try downloading Catalina from the App Store, you may get a partial installer app that won’t work with AutoDMG. Upon opening the Patcher Tool, you’ll want to click Continue until you see this screen and can click Download a Copy.

Download DosDude’s Catalina Patcher Tool to aid in downloading a full macOS Catalina installer.Download the latest version of AutoDMG (linked to above).This will take up roughly 30 GB of storage, so be prepared. You not only have to download the full macOS Catalina installer, you also have to copy it onto a DMG, and then create the final deployable DMG.

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First of all, make sure you’re performing this on a computer with plenty of free space.

After reading through some of the reported issues with the latest beta, it was suggested that creating a DMG with the Catalina installer on it, then mounting said DMG and using the Catalina installer from that will resolve the issue. However, if you try and create a DMG like normal using AutoDMG, you’ll get an error suggesting that ist is not present in the Catalina installer (which isn’t true). According to the release notes, it supports creating DMGs of macOS Catalina. The key here is using the latest beta version of AutoDMG (at the time of writing this, it is v1.10b587). The writing is on the wall that being said, I still have a lot of non-T2 chip machines which makes this worthwhile. Also, remember that this will not work on machines with a T2 chip. However, thanks to an updated version of AutoDMG, DeployStudio lives again.Īs far as the steps to deploy an APFS image to a machine using DeployStudio, refer to the other article, nothing has changed. This is because of Catalina’s unique method of partitioning the APFS container into multiple sections, including both a read-only system volume and a writeable data volume. With the release of Catalina, I had figured this method of preparing machines would end. Back in March, I authored a post on using DeployStudio to image the latest macOS releases that utilized APFS formatting.