Its really simple. First, go here:

http : //ww1w 1.spee 1dru n. c o1m/ Fallo 1ut _4/threa d/fvo 80

(Remove spaces and 1s)

Then, download the revert 1.3 to 1.2 patch. Place all of the files in your directory that contains fallout4.exe, and run the patch.bat.