The intro.zip file you have requested: Media / Videos and Trailers / Thief Intro Movie - 23.7mb is not available. Perhaps try browsing all files for the game Thief and upload any files you want to share or are missing. This is the only information we could locate:
This is an older draft of the Thief introduction. The only differences are at the beggining and the end. Either way it is recommended and really cool.