Once the files are downloaded to your Steam content folder, manually replace your existing Fallout 4 installation with these files. Method 2: Simple Fallout 4 Downgrader
: It avoids certain bugs introduced in the "Next-Gen" update, such as the broken VATs targeting or weapon debris crashes . How to Download and Install Update 1.10.163
Fallout 4 Update 1.10.163: The Ultimate Legacy Version for Modding
This is the official way to retrieve old files directly from Steam's servers.
: The majority of high-quality script-based mods were built and tested on this version.