The official OpenCore documentation assumes you are on macOS or a Linux terminal. To build a bootable USB on Windows, you traditionally had to:
Inside the VM, download the full macOS installer from the App Store or via gibMacOS .
Open (press Win + X and select Disk Management).
A vanilla OpenCore installation requires specific drivers and kernel extensions (Kexts) tailored to your hardware. Download these files and place them into their respective folders inside EFI/OC/ . Required Drivers ( EFI/OC/Drivers/ ) opencore offline installer windows
: A bootloader extension required for almost all other kexts (Mandatory). WhateverGreen : Used for graphics card patching. AppleALC : Used for onboard audio patching.
Run the command for your desired macOS version. For example, for Monterey: python macrecovery.py -b Mac-FFE5EF8117AD88F1 -m 00000000000000000 download
An offline installer requires the OpenCore bootloader to be manually placed in the EFI partition so your PC can read the macOS drive. Creating the Folder Hierarchy The official OpenCore documentation assumes you are on
Locate your USB drive, right-click all existing partitions, and delete them until the drive shows as . Open a command prompt as administrator and type diskpart . Run the following commands sequentially: list disk (Identify your USB disk number, e.g., Disk 2) select disk X (Replace X with your USB disk number) clean convert gpt create partition efi size=200 format quick fs=fat32 label="EFI" assign letter=S (Assigns letter S to the EFI partition) create partition primary format quick fs=exfat label="Install"
Set up a temporary macOS Virtual Machine (VM) on your Windows PC.
: Under the Misc -> Security section, ensure SecureBootModel is set to Default or Disabled . For an offline installation, setting it to Disabled can prevent verification loops if system clocks are out of sync. WhateverGreen : Used for graphics card patching
Set XhciPortLimit to True if you are on an older macOS version, or ensure your USB ports are mapped if installing macOS Big Sur or newer.
Using an OpenCore offline installer Windows is a straightforward process. Here's a step-by-step guide to help you get started:
Mount your USB's EFI partition using Windows Disk Management or a tool like MiniTool Partition Wizard. Create a directory structure matching this layout:
Advanced users can modify the EFI/OC/config.plist and EFI/OC/Kexts folder before running the script. The batch script preserves any customizations placed inside the OfflineTemplate directory.