You caught me without pants as I just left one desktop for another and lost my collection I torrented from rutracker (most of it is abandoned anyway). I remember Goetrik and Fenix being a funny series of books, and from the lore books something called Black Library (?) published great in-world books, including a very cool medievally stylized manual for inquisitors.

Guess it's their site: https://www.blacklibrary.com/warhammer-40000

I can produce a magnet link to both if you are interested.