During the shift towards the Apple silicon era in 2021, macOS Big Sur (version 11) emerged as a pivotal release. While Apple typically distributes its operating systems through the App Store, advanced users, developers, and IT professionals often require a standalone macOS Big Sur ISO file for virtualization in software like VMware or VirtualBox. The Significance of the ISO Format
hdiutil create -o ~/Desktop/BigSur2021 -size 16384m -volname BigSur2021 -layout SPUD -fs JHFS+
You can download the official "Install macOS Big Sur" application through these methods: App Store: macOS Big Sur App Store page . This will open Software Update to start the download. Terminal Command: macos big sur iso 2021
Step 1: Download the Installer
Open the Mac App Store on a supported Mac and search for "macOS Big Sur." Download the installer. It will appear in your /Applications folder. During the shift towards the Apple silicon era
By default, Apple distributes macOS as an application (.app) or a DMG package through the Mac App Store. An ISO file is a disk image format typically used for Windows or Linux distributions. You can download the official "Install macOS Big
| Method | Difficulty | Performance | Legality |
|--------|------------|-------------|----------|
| Official .app → VM (macOS host) | Easy | Native | ✅ Legal |
| InstallMacOSBigSur.dmg → VMware (Windows) via unlocker | Medium | Fair | ⚠️ Gray area (Apple EULA forbids non‑Apple hardware) |
| Hackintosh (OpenCore) with Big Sur | Hard | Excellent | ❌ EULA violation |
| Cloud macOS (MacStadium, Scaleway) | Easy | Great | ✅ Legal (but paid) |
2021 was the peak of Big Sur ISO demand, but even then, smart users stayed away from random ISOs. The few legitimate use cases never justified the risks.
Verdict: Always create your own macOS Big Sur ISO from Apple’s official installer.