Nothing happens after clicking Yes, I have MetaTrader 4

 

I have MT4 running on Max OSX. 

I know how where to place and refresh the indicators and EAs, but when mql5.com's demo link prompts me to click if I have MT4, then nothing happens when clicked.

Does anyone knows how to make this work? Thanks :-)

Files:
demo.jpg  34 kb
Reason: