Various versions (like 1.1 or 2.0) of these community-made rulebooks can be found on document-sharing sites like Scribd or Internet Archive .
For the Fallout "pen and paper" roleplaying game, you can download official character sheets, rulebooks, and starter materials directly from the following sources: Official Roleplaying Game Downloads
Before the official 2d20 system, several fan-made "Fallout PnP" systems were created: