I just noticed you are not able to reach the main mirror site of beyondunreal.com`s file work anymore including the download links itself, so I think until its fixing I have to post the download sites I can google here.
http://www.gamefront.com/files/13873311 ... ack_2.zip/
http://www.mapraider.com/maps/?fileid=4541
http://www.atomicgamer.com/files/78775/ ... pack_2-zip
http://www.ut-series.cz/ut99/downloady.php


