Views

hdiutil attach /tmp/Sierra.dmg -noverify -mountpoint /Volumes/ISO

Use Apple's built-in creation utility tool to install the core operating system framework directly into your mounted volume.

Follow this simple guide to download the safe files and make your ISO. Step 1: Download Official macOS Sierra Files

If you must use Sierra, implement these safeguards:

Clean up temporary files:

hdiutil attach /Applications/Install\ macOS\ Sierra.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app

Fix: This happens because Apple's security certificates for older installers have expired. Disconnect your internet connection, open Terminal during the installer boot screen, and type date 0701000017 (This rolls back your system clock to July 2017). Try the installation again.

A: Yes, macOS is free software from Apple. However, it is licensed for use on Apple-branded hardware only (except in virtualized environments on Apple hardware). The software itself is legally available for download.

Once you have the in your Applications folder, you can use the built-in Mac Terminal to create a bootable ISO file.

If you need a pre-made file, check the community-built macOS Sierra 10.12.6 ISO on Internet Archive . Step 2: Create a macOS Sierra ISO on a Mac

When trying to update from an earlier Sierra version to 10.12.6, you may encounter "Cannot verify this update" errors. Download the standalone Combo Update from Apple Support (KB/DL1931) to bypass this issue.

If you've downloaded the macOS Sierra installer, you can create an ISO file from it using the following steps: