I think you should put the newest version of the product that you offer, it is a bit of care when it comes to these things, also to do it much better you can put the statistics of hits and losses, this so that you have a guarantee that it works well.

Personally I do not think this will work. If this would be a legitimate company, then they would have nothing to hide.
Secondly, I BET (haha) that they want to receive the funds first, before releasing the code. To many people try to make money like this.
Or even when they provide you a document, it will be a useless software script, and then you lost your money.
OP: Maybe it is an idea to put in your announcement that you are open to provide scripts, before people have to transfer the Bitcoins to you. That would help a lot, for sure.
And regarding the demo, do you provide an back-end and front-end?

ya.ya.yo!

I used Google Chrome to log in to the site and also encountered this breakdown.

Maybe it's really your browser. I have opened the link that op provided and there's no problem at all. The question is how would the scripts be helpful to those who will buy this script?. As most of what I have read some people would only use script to make their bets automatic but mostly they only need bot for automatic betting.

Your links don't work for me. Maybe it's the browser?