: The Fallout 4: GOTY Edition on GOG often allows you to disable auto-updates or roll back to previous versions.

While you cannot "free download" the full game legally, if you already own it on Steam, you can revert or "downgrade" to this specific version for free using built-in developer tools.

In the Steam console, use the download_depot command followed by the specific manifest IDs for v1.10.163.0.

: Community-made tools like the Fallout 4 Downgrader on Nexus Mods automate this process for you. System Requirements (v1.10.163.0)