Its the client auto download that needs to be enable. Until they upload the mod you can't fix the little bastards.
Now that Zerowingzero mentioned it I remember an ancient post on how SlowMotion death was causing connection problems for dedicated servers.
The traffic and uploads have picked up considerably since his friendly reminder of the Slow motion death bug.
Maybe you could fix this bug?
SlowmotionDeaths really enhance duels.
I've mailed you some info on my server.