Getting an Error

Hey, I'm new to this, but I intend on using this mod:

http://www.mpgh.net/forum/281-call-d...ld-scar-h.html

and I presume that I need to just copy the files from the mod that I downloaded and replace the orginal files for the scar, but I keep trying and get this error message:

Cannot create __rzi_11.464

Any help is very appreciated.