Groups like BlackBox Repack take the original game files (which might be 10GB or more) and use advanced compression algorithms to shrink them for easier downloading.
: A text-based list of exact X/Y coordinates for players who want to use the in-game map pinpointing. Essential Technical Fixes prototype 2 blackbox download
: A comprehensive "useful post" that breaks down every district with detailed descriptions. GameFAQs Coordinates List Groups like BlackBox Repack take the original game
scattered throughout the game's zones rather than a software download. Prototype Wiki prototype 2 blackbox download
Remember: the only black box you need is the one in-game containing the Blacklight virus. Not one on your hard drive hiding malware.