If you are genuinely searching for these files (for archival, research, or completist purposes), the 4plebs method is obsolete. The community has moved to decentralized platforms like Soulseek or private Discord servers. The search engines have de-indexed most of the direct links.
Keep in mind that some of these resources may be available in PDF format, while others may be online-only content.
While many seek PDFs through archives, official digital copies are available via the Black Library App and specialized retailers: