Create a Modelfile :
Title: TeknoMW3 2.8 0.5b Available — Download Now!
: Copy the downloaded TeknoMW3 files into your MW3 installation directory.
Compare the output to the hash provided on the model page. If they don't match, delete the file and re-download.
Extract the downloaded .zip or .rar archive and copy all files into your main game directory (usually Steam/steamapps/common/Call of Duty Modern Warfare 3 ).