A: You have downloaded a fake. A real macOS Big Sur ISO is 12GB to 14GB . Delete it immediately.
Alternatively, if you have a legitimate copy from 2021: macos big sur iso 2021
# If the installer is in your Applications folder ls -la /Applications/Install\ macOS\ Big\ Sur.app Open Disk Utility or use Terminal: A: You have downloaded a fake
mv ~/Desktop/BigSur2021.iso.cdr ~/Desktop/BigSur2021.iso You now have a pristine, bootable macOS Big Sur (2021) ISO. The 2021 ISO is specifically required for VMware because newer macOS versions (Ventura+) require hardware NVRAM fixes that break on older VMware versions. Alternatively, if you have a legitimate copy from
Published: Retrospective Look (Updated for 2025 Users)
Do not risk your system’s security by downloading a random ISO. Take one hour to follow Part 3 of this guide. Create your own ISO using Apple’s genuine 2021 installer payload. Store that ISO on an external SSD. You will thank yourself in 2026 when you need to roll back a failed macOS update.
But why “2021”? macOS Big Sur was originally released in November 2020. The 2021 versions (specifically 11.2, 11.3, and 11.4) contained critical stability fixes, better M1 emulation support, and security patches that the initial 2020 launch lacked.
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