The siphon_ut2k4.zip file you have requested: Skins / Skin Packs / S to T Titles / Siphon Skin Pack - 7.1mb is not available. Perhaps try browsing all files for the game Unreal Tournament 2004 and upload any files you want to share or are missing. This is the only information we could locate:
Siphon for the Cybernetic Male comes from Maarten Kropff. 4 teamcolors are included. Each teamcolor can also be chosen seperate for deathmatch games.