Open your browser and type steam://open/console to launch the Steam console.
Downgrading your game may break Creation Club content and requires you to disable automatic updates in Steam. fallout 4 version 1.10.163 download
If you own the Steam version, Valve allows you to download old manifests via the Steam Console. This is the safest method. Open your browser and type steam://open/console to launch
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If you haven't committed to the Steam version, the Fallout 4: GOTY Edition on GOG is natively version 1.10.163 . It does not force updates, making it the most stable option for long-term modding.