macOS Golden Gate (version 27.0) can run alongside macOS Tahoe on the same physical Mac using a separate APFS volume, no second machine required. Two terminal commands handle the download: 'softwareupdate --list-full-installers' to confirm availability and 'softwareupdate --fetch-full-installer --full-installer-version 27.0' to pull the full installer.
The process breaks into four steps covered across 12 minutes: downloading the installer, creating a new APFS volume in Disk Utility, running the install targeting that volume, and switching between the two systems at boot. APFS volume isolation means Golden Gate gets its own space without touching Tahoe's partition or data.
The full written tutorial at 9to5Mac documents every step if you need a reference you can follow without scrubbing video. The section worth watching closely runs from 03:14 to 10:13, where the actual install targets a specific volume rather than the default disk, which is exactly where this process breaks for most people trying it blind.
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