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If you get an error message about the installer being killed immediately, Apple has likely expired the "code signature" of the tool. You can fix this by removing the digital signature in Terminal:

Press the button while immediately holding down the Option (Alt) key on your keyboard.

: Always use Time Machine or another method to back up your data before proceeding.

Additionally, 64-bit applications that may not run on Catalina or newer versions function flawlessly on High Sierra, making it a favorite for creatives and professionals with specific software needs. download+macos+high+sierra+10136+dmg+mac+install

If you downloaded the DMG specifically for a VM (like VirtualBox on a Windows PC):

Apply the latest security patches and the macOS High Sierra 10.13.6 Supplemental Update to ensure your system is as secure as possible.

softwareupdate --fetch-full-installer --full-installer-version 10.13.6 Use code with caution. 3. Alternative: Direct DMG/ISO Sources If you get an error message about the

Before we begin, a crucial warning: . This means it no longer receives critical security updates from Apple, leaving your system potentially vulnerable to modern threats. It is best used only on an isolated, offline machine, or temporarily to run a specific legacy application. If your Mac is compatible with a newer version of macOS, you are strongly encouraged to upgrade for your security.

Whether you need a bootable USB to revive a 2011 iMac, or you simply want to archive the InstallESD.dmg for future legacy software testing, the methods above remain the gold standard. Remember to verify your SHA checksum, set your system date back if you see certificate errors, and never download an installer from a third-party ad-link farm.

A: No. The earliest officially supported Macs for High Sierra are: MacBook Pro (Mid 2009 or later), iMac (Late 2009 or later), Mac Pro (Mid 2010 or later). You can use patching tools (DosDude1’s High Sierra patcher) for 2008 models, but that is outside this guide. Additionally, 64-bit applications that may not run on

Apple provides a dedicated support page for downloading older versions of macOS.

High Sierra converts SSDs to APFS automatically. If the install hangs at "Converting to APFS":