The bloodorg_110809_1813.zip file you have requested: Maps Levels Missions / Versus Maps / Left 4 Dead Versus Map Blood Origins - 7.53mb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:
This is a Release Candidate of map 1. 4 map campaign. Parallel storyline to that of the official campaign. Goal is to have each map play to one or more of the SIs strengths. Map 1 is for hunters and feature a lot of high, long jumps.