The main code in that script in binary encoded. Which means that no one but the author can see the code as plain text. If they don't respond to you I don't think anyone else will be able to help.
However if you are sure the problem has nothing to do with the script you don't need to see the code. Although the other computers may seem identical there must be something different about the one on which the script will not run. Maybe user permissions?
Having said that, 'variableName is undefined' is a syntax error and normally means there is something wrong with the script's logic. It is trying to use a variable that it expects was created in some other part of the script but wasn't.