Apple packages its operating systems in .dmg (Disk Image) or .pkg formats, which are native to macOS. Windows PCs and virtualization software like VirtualBox require a standard .iso format.
The file you download from Apple is often a .dmg or .pkg that doesn't work as a bootable image on its own. You need to find the hidden InstallESD.dmg file inside: 0;265;0;412;
Assuming the "Install Mac OS X Lion" app is still in your Applications folder, run the following command (you may be prompted to enter your administrator password): /Applications/Install\ Mac\ OS\ X\ Lion.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ Mac\ OS\ X\ Lion.app --nointeraction mac os lion iso
It's crucial to understand the legal context:
Older macOS installers contain digital certificates that have since expired. Attempting to install them today often triggers errors like "This copy of the Install Mac OS X application cannot be verified." Apple packages its operating systems in
Later, due to complaints from users with slow internet connections, Apple sold a physical USB thumb drive containing the installer for $69. However, they never officially distributed the operating system as an ISO file.
Use the asr (Apple Software Restore) tool to restore the Lion installer package onto your mounted image. Paste the following command (assuming you used the standard download location): sudo asr restore -source /Applications/Install\ Mac\ OS\ X\ Lion.app/Contents/SharedSupport/InstallESD.dmg -target /Volumes/LionInstall -noprompt -noverify You need to find the hidden InstallESD
For users with a legitimate need, here are general steps for popular hypervisors. The process is similar for both.
If you are trying to install Lion on a physical Mac, creating a bootable USB drive is the most effective method. You can accomplish this easily by using Terminal: Insert a USB flash drive (8 GB or larger) into your Mac.
Now that you have a legal ISO, here is how to deploy it for three common use cases.
Once you have downloaded the .iso or .dmg file, you can create a bootable USB drive to install it on a Mac. on your Mac. Insert a USB Drive (at least 8GB recommended).