If you downloaded the macOS High Sierra DMG file from Geekrar and it is asking for a password to open the .rar file, the password is: How to Use the Password
Compressed files can sometimes corrupt during download. A password check ensures that the file is not opened until the download is complete, reducing the chances of broken DMG files.
Leo stared at the screen. He typed ://geekrar.com . He tried GEEKRAR . Denied.
: Manually type geekrar.com in lowercase letters. Do not copy and paste the password, as pasting often accidentally includes a hidden space at the beginning or end of the text. Official Alternatives: How to Get macOS High Sierra Safely
For safety, I recommend getting macOS only from Apple directly. If you still need help extracting your own legitimate .rar file (for non-copyrighted data), tools like or Keka (both free) can handle .rar files on Mac.
When prompted, enter exactly: Geekrar.com . Why is the file password-protected?
Legitimate access to High Sierra remains possible via Apple’s official methods. If you cannot use those, consider running High Sierra in a virtual machine (VMware or VirtualBox) with a legally obtained copy.
After extraction, you'll find a .dmg file. Double-click on it to mount it. You might need to authorize it in the System Preferences under Security & Privacy settings if you're using a newer version of macOS.