1) Make sure that you have updated/patched Wolfenstein to 2.60 (see readme in the parent directory).
2) Unzip "Enemy Territory 2.60b patch.zip" (contains ET.exe and ETDED.exe) to the same directory that you
installed Wolfenstein: Enemy Territory to (default is \Program Files\Wolfenstein - Enemy Territory).
   -Make sure you overwrite the older files.  That's it!