The sp-perilpack.zip file you have requested: Maps Levels Missions / Other Maps / S to T Titles / UT Special Edition Peril On Mars Map Pack - 8.44mb is not available. Perhaps try browsing all files for the game Unreal Tournament and upload any files you want to share or are missing. This is the only information we could locate:
extract all files in your UnrealTournament directory
open the unrealtournament.ini in the utsystem folder
scroll a bit down and you see this:
Chang A new Special editition Single Player map pack for UT complete with dificulty level support, full item balance, new translator events, and a more satisfying ending.