Thanks for your answer.
I tried to install everything from scratch… WordPress 4.4.2, Verse Theme, Download Magaer Free, Premium Packages, Extended Short-codes and TinyMce Button.
‘Checkout’ Button still not working. I tried to change theme , same result… is not working.
I don’t kmow what to do… i was thinking about purchasing pro version, but if it does not work in the free version. I’m not sure at all.