I just downloaded the Game and tried to start it up. I got an Error Message saying there is missing Data and it tells me to add thing to -basedir /path/to/game If there is anyway you guys can help me please do. I do not want to re-download this again.

Another thing If you have the File I need can you send it too me some how?

Can you tell us more about your system? Windows? LInux? Make sure you extract the zip file 'with Paths' and in the case of linux also use the nexuiz-linux-glx/sdl.sh files
Check that there is a directory Nexuiz/data and that it contains a large data*.pk3 file