Help with Maps, Cant play certain maps Options

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Today I tried to go on the CTF Rifles server with a couple people today and when I clicked on the server, it started to download something. Dont know if it was a map or a mod or whatever. But while it was downloading I heard someone say on vent to use our password and I hit esc. to go and put the password in. After I put the password in, I clicked on the server again but now there was no download attempt and it gives me this:

I assume that the maps didnt load correctly. It happens with a couple maps such as Harbor, Carenten and now POWCamp. I tried to locate these maps in my UO folder to delete them and hopefully re-download, but cant locate them.

I also went and downloaded the UO mappack and when I try to run it it tells me that my version of COD UO is invalid???

Im stuck. Would like to play these in the rifles server, but need some help. Can someone tell me what I need to do?