None of the bonus pack download links on the UTAS downloads page work (for me anyway), so here's some working ones for whoever needs em.
http://data.unrealtournament.com/UTBonusPack1.zip
http://data.unrealtournament.com/UTBonusPack2.zip
http://data.unrealtournament.com/UTBonusPack4.zip
http://data.unrealtournament.com/UTInoxxPack.zip
http://data.unrealtournament.com/UTBonusPack1.zip
http://data.unrealtournament.com/UTBonusPack2.zip
http://data.unrealtournament.com/UTBonusPack4.zip
http://data.unrealtournament.com/UTInoxxPack.zip