This is the error I still get on the last page of checkout.

Notice: Undefined variable: track in /home/content/86/7396286/html/plugins/system/gacode.php on line 129

Warning: sprintf() [function.sprintf]: Too few arguments in /home/content/86/7396286/html/plugins/system/gacode.php on line 129

I actually downloaded this version today. This is the version that's giving me the error message.

Thanks-Where can I download the fixed version?

Hi-Have the same problem. I can see the line of code you are referring to on line 129.
I'm just not sure if I'm suppose to remove it to fix the problem.
Will it still track sales?