The default RT RD path is C:\ and default file type is wma, if you use these already you don't need to Edit.
if you have the tracks on another drive like F: set it to the drive: default_tracks_dir = "F:\\bb\\RealTracks\\"
the default file type is wma
if you are using wma set it to: file_type = ".wma"
if you are using wav set it to: file_type = ".wav"
then use Ctrl+S to save script and run, it will browse for the SGU MGU.. you can cancel out and close the script then run it from the Action box, just search for SGU and it will show, select it then click Run.
Code
default_tracks_dir = "C:\\bb\\RealTracks\\" --(for Win use \\, for Mac use / :default directory for RealTracks wav files
default_drums_dir = "C:\\bb\\Drums\\" --(for Win use \\, for Mac use / :default directory for RealDrums wav files
file_type = ".wma" --{".wma",".wav",".m4a",".aiff",".flac",".mp3",".wv",".ogg"}