The they_still_walk_ep1.zip file you have requested: Maps / Single Player / They Still Walk - 8.73mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
I'm using the story from the comic book/animation I made a few years ago called They Still Walk. Originally, it was supposed to be a mini 3D movie project, but due to financial and resource limits, the idea was then made into a comic book and a series of flash animation. Currently, I am trying to recreate it using the Doom 3 engine for nostaligia (and the delight of friends).