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We’ll be using OpenCore as a bootloader for Catalina. Building the offline installer requires you to have a Mac, here are the instructions. If you won’t have an Internet connection available to Catalina during installation, or your network can’t provide an IP address by DHCP you’ll need to build an offline installer instead. Upload the “ISO” to your Proxmox server’s ISO store (typically /var/lib/vz/template/iso).

The result is actually a raw disk image, not a true ISO, but Proxmox has better tools for picking and re-using ISO images than disk images. Qemu-img convert BaseSystem.dmg -O raw Catalina-installer.iso # Or use qemu-img from the qemu-utils package to do it instead:

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Or like so if you’re building this on Linux: # Install the dmg2img package and.ĭmg2img BaseSystem.dmg Catalina-installer.iso Convert that dmg into an “iso” like so if you’re building this on macOS: hdiutil convert BaseSystem.dmg -format UDRW -o Catalina-installer.iso This results in a ~500MB “BaseSystem.dmg” file in the current directory.

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Download and run fetch-macOS.py in a terminal to download the Catalina recovery image from the Apple software distribution server (this can be run on Linux, Proxmox, or on a Mac): The easiest installer to build is a recovery image, which will download Catalina during installation. Modern AMD CPUs also support SSE 4.2 and will work with this guide. Older CPUs will cause the finder to repeatedly crash after installation completes (with an Illegal Instruction exception in the graphics code).

Your Proxmox host computer’s CPU must support SSE 4.2, so for Intel your CPU must be at least as new as Nehalem, which was the first CPU generation to bear the “Core” i5/i7 branding. You also need a real Mac available in order to fetch the OSK key. I’ll assume you already have Proxmox 6.1 or 6.2 installed. If you’d like to use Clover instead, use my older tutorial, but OpenCore works better! Requirements

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You can get the full sourcecode on my GitHub here. This tutorial for installing macOS Catalina using OpenCore has been adapted for Proxmox from Kholia’s OSX-KVM project and Leoyzen’s OpenCore configuration for KVM. MacOS 11 Big Sur has now been released! If you’d like that version instead then please use my new Big Sur installation guide!

Installing macOS 12 “Monterey” on Proxmox 7.

Expanding the disk of your Proxmox macOS VM.

Driving a 4-pin computer PWM fan on the BTT Octopus using Klipper.

Installing macOS 13 Ventura Developer Beta on Proxmox 7.2.

Installing macOS 13 Ventura on Proxmox 7.2.

Fixing Xcode on Monterey under OpenCore Legacy Patcher.

Reverse-engineering lens mounts for 3D printing.

Select it and your PC will boot into macOS. This time, the Unibeast boot menu will display the macOS boot disk. When it’s done, restart your PC, with the USB drive still plugged in. After half an hour or so, it will finish. Select the drive and step through the installer until macOS starts installing itself. When the drive has erased, quit Disk Utility and the drive should be available to select from the installer.ġ2.

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Make sure Mac OS Extended (Journaled) is selected and the Scheme is set to GUID Partition Map, then click Erase. If that’s the case, click the Utilities menu and, when Disk Utility opens, choose the hard drive you want to install macOS on and click the Erase tab. When it comes to selecting the drive on to which you want to install macOS, there may be no options to choose from. Use your PC’s arrow keys to navigate to ‘External’ and press ‘Enter.’ The macOS installer should now start.ġ1. It should now boot into Unibeast and give you the option of which drive to install from. Plug in the USB stick on which you installed Unibeast and restart your PC.

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If you’re downloading Mojave, download another version on a Mac that hasn’t yet been upgraded to Mojave, otherwise it will just update your current version.ġ0.

When it’s finished, if you’re downloading High Sierra on a Mac running Mojave, you can quit System Preferences and look for the High Sierra installer in your Applications folder. When you start downloading, System Preferences’ Software Update will launch and show the progress of the download.

Search “High Sierra”, for example, and it won’t turn up. Recent versions of macOS used to be easily accessible on the Mac App Store. to download it, but once you’ve done that you’re ready to go. It’s a free Mac app that creates an installer for macOS on a USB stick which is capable of being installed on an Intel PC. One of the most popular installer creation tools is Unibeast.