Design Importer problem.

i just have installed the theme and when i tried to import a design it told me this:

There was a problem with getting a list of available Designs for import. This can happen for several reasons:Our server could be down. To verify this, check if you can open this URL https://api.apollo13.eu/file_sender/definitions/rife-free_demos_definition.php. If it opens, then our server works well.Your server does not recognize our SSL certificate. Typically, upgrading the server PHP version to version 7.X solves the problem.Your server is blocking our website by a firewall or something similar. You could ask your server admin to add our demo data server to the “white list”: https://api.apollo13.eu/file_senderIf this does not solve the problem, please contact us.

i checked the site and it shows bunch of random words like:

[“Pro”,”Business”],”demo_url”:”https:\/\/rifetheme.com\/rebro\/”,”background”:”rgba(0,0,0,0.5)”,”font_color”:”#ffffff”},{“name”:”Fully”,”id”:”fully”,”revo”:

i don’t know if the server is down or not by that but anyway the other 2 solution I don’t know there steps can you explain them? or just give me another solution?

The page I need help with: [log in to see the link]