The two primary causes are; attempting to install on a Mac that Catalina doesn’t support, or trying to install Catalina on a Mac with limited storage space. Supported Macs: Most Macs from 2012 or later support macOS Catalina. The lone exception is the 2010-2012 Mac Pro, whose graphics cards don’t meet Catalina requirements. Attempting to install Catalina on an unsupported Mac is in no way supported by Apple, and you are doing so at your own risk. Select your USB drive installer from the boot list. The Mac Mini 2020 instructions are to use the USB-C port is closest to the Ethernet port. How to boot a M1 Mac Mini 2020 into DFU mode to restore macOS – Image: Apple Inc. Disconnect the power cord from the Mac Mini. Plug USB-C/Thunderbolt cable into the USB-C port next to the ethernet port. Plug the other end into the Host Mac. The keyboard and mouse or trackpad that came with your Mac. If they aren’t available, use a USB keyboard and mouse. A full-installation, 64-bit version of Windows 10 on a disk image (ISO file) or other installation media.
Boot Camp Assistant User Guide
You can use Boot Camp Assistant to install Windows 10 on your Intel-based Mac.
Newer Mac computers use a streamlined method to install Windows on your Mac. To find out whether your Mac uses this method, see the “Learn more” section in the Apple Support article Install Windows 10 on your Mac with Boot Camp Assistant. If your Mac is an older model that requires an external USB drive, follow the instructions in Install Windows on your older Mac using Boot Camp instead.
What you need
The keyboard and mouse or trackpad that came with your Mac. If they aren’t available, use a USB keyboard and mouse.
A full-installation, 64-bit version of Windows 10 on a disk image (ISO file) or other installation media.
You can download a Windows 10 Disc Image (ISO File) from Microsoft.
Sufficient free storage space on your startup drive. For information about the amount of free space needed, see the Apple Support Article Install Windows 10 on your Mac with Boot Camp Assistant.
Before you begin
Before you install Windows, make sure you back up important files.
You can use Time Machine or any other method to back up your files. For information about backing up files, see Back up your files with Time Machine and Ways to back up or protect your files.
Perform the installation
On your Mac, do the following steps in order.
Step 1: Check for software updates
Before you install Windows, install all macOS updates.
On your Mac, log in as an administrator, quit all open apps, then log out any other users.
Choose Apple menu > System Preferences, click Software Update, then install all available macOS updates.
If your Mac restarts after installing an update, open Software Update again to install any additional updates.
Step 2: Prepare your Mac for Windows
Boot Camp Assistant prepares your Mac by creating a new partition for Windows named BOOTCAMP and downloading the Boot Camp support software.
Important: If you’re using a Mac notebook computer, connect it to a power source before continuing.
On your Mac, open Boot Camp Assistant , located in /Applications/Utilities.
At the Introduction screen, click Continue.
The system is checked for total available disk space. Older Time Machine snapshots and cached iCloud files are removed to make space for Boot Camp. This process may take a long time to complete (you can click the Stop button to skip this process).
If you have only one internal disk, choose the Windows ISO image, specify the partition size by dragging the divider between the macOS and Windows partitions, then click Install.
If you have multiple internal disks, follow the onscreen instructions to select and format the disk you want to install Windows on and to choose the Windows ISO image.
If you select your startup disk: You can create an additional partition for Windows. Specify the partition size by dragging the divider between the macOS and Windows partitions.
If you select an APFS-formatted disk: You can either create an additional partition on the disk for Windows, or erase the entire disk and create a partition for Windows. If you choose to create an additional partition, specify the partition size by dragging the divider between the macOS and Windows partitions.
If you select a non-APFS-formatted disk: You can erase the entire disk and create a partition for Windows.
If Boot Camp is already present on the disk you select, you also have the option to uninstall it.
Important: You can’t resize the partition later.
When this step is complete, the Windows installer starts.
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Step 3: Install Windows
In the Windows installer, follow the onscreen instructions.
When the installation is finished, your Mac automatically restarts using Windows.
Follow the onscreen instructions to set up Windows.
Step 4: Install Boot Camp on Windows
After installing Windows, Boot Camp drivers that support your Mac hardware start installing.
Note: If the support software doesn’t install automatically, you need to install it manually. For instructions, see the Apple Support article If the Boot Camp installer doesn't open after using Boot Camp Assistant.
In the Boot Camp installer in Windows, follow the onscreen instructions.
Important: Do not click the Cancel button in any of the installer dialogs.
If a message appears that says the software you’re installing has not passed Windows Logo testing, click Continue Anyway.
You don’t need to respond to installer dialogs that appear only briefly during installation, but if a dialog asks you to install device software, click Install.
If nothing appears to be happening, there may be a hidden window that you must respond to. Look behind open windows.
When the installation is complete, click Finish.
After your Mac restarts, follow the instructions for any other installers that appear.
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