free paypal module displayed at addons at prestashop site doesnt work

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free paypal module displayed at addons at prestashop site doesnt work 

We have installed many fresh installation and test it new sites done for some company and paypal button at the last part of the checkout doesnt work

Example of a site under process

http://sistemasdecolgar.institucion.net/proyecto/   u  try to checkout and Paypal option in the last step doesnt work

Also in much new sites done by us by using 1.7.3.3 doesnt work

Please try in localhost, u will see fresh installations same problem, so problem with the theme it seems as its the default one coming by prestahop 1.7.3.3

Any idea?

thks