Ouch! I don't know of any easy "fix" for that, and I'm sure it would involve manipulating the upload code (which is a bit problematic, as the script in question is not licensed appropriately for such modification).
I'm also thinking the "absence" of that "support" page at their website might indicate this is a "known" problem.
I also realize now that you are using version 2.0 of the program (I originally looked at version 1.0 when preparing my first responses to you - I apologize for the "bum steer" on the configuration screen). From looking at the demo on the website, I suspect the whole limit files-size issue might be one of the differences between the "free" and $299 version, as a "limit file size" setting is available on the demo of the paid version.
I'm sorry, I don't have any other suggestion at this point, except to see if you have any luck contacting cyberscript.net for a possible solution or workaround (which I would not be surprised if they are unwilling to discuss regarding the "free" version).