The klasnic_sigma_ut2k4.zip file you have requested: Skins / Animated Robot / SIGMA [Animated Robot] v1 Skin - 3.07mb 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:
Description: Animated Robot [Artificial Lifeform] for UT2004. Full 4 team gametype support and yes, it does glow in the dark ;) This character was made for UT2004 and as with all my UT2004 stuff is unsupported and won't work as it's designed in UT An animated robot for UT2004 with full CTF4 support.