If it's just a plain .bsp file, you don't need to unzip or extract anything, just copy-paste or move the file into your maps folder.
It's .bps.bz2, not just .bsp, otherwise i'd probably be fine.
odd, what program are you using for the bzips? Also have you tried the obvious in extracting the files to a different directory? Maybe you're getting a permissions error?
I'm using the basic Archive Utility that came with my mac. And yes, i've tried moving the files to my desktop and the downloads folder with no change. I've as well tried unzipping on my other computer with Winrar, but: "Unnexpected end of archive."
just download the .bsp instead of the .bz2
prob solved
Excuse my slight stupidity, But how would I do this? I've tried "Download as..." and changed it to just .bsp, but it just changes back. How would I just download the bsp?