Ran fine for me, processed 2557 frames, and output them to the correct area.
Did you follow the steps fully?
First browse to the .tgs, click it and hit open.
Then for the save to, hit browse, go to where you want to save it, and type a name at the bottom for filename, and hit save.
Then hit convert. You should be able to open it up just fine afterwards, in nameofsavedfile.txt, and it should display a message with the number of frames processed.
Heres the output i got by running it with default settings for size/offset.