Problems getting in, for some people Options

[Spectre Nexus]

Lt. G Reaper and Agent Inky, two of the people I normally play with on FK's server, have just downloaded the new map pack, and can't join now.
They both had no problem earlier, but now that they have downloaded the new pack and installed it they can't get in. It load's about 3/4 of the way then they get "server disconnected". I was in game and it said nothing in the console about why they were disconnected.

Anyone else having this problem???

I myself have had no problems, as of yet.

[Spectre Nexus]

Okay I walked Inky through the re-install process.. He removed everything and re-downloaded all the mappacks.
When he tried to get in it said
"Agent_Inky Unpure client detected invalid .pk3 files" in console

Now we just download all the files for fk's server striaght off of MOB's site.
the only other files that were in there were the ones that were supposed to be, and there were no other .pk3 files in there.

So my question again is WHY??????

Agent Inky and Lt. G. Reaper still can't get into the server and god only know's who else can't get in, and so those two myself and TeamCanada have all been playing a different server because they can't get in here.