cURL error 7: Theme Registration

I want to register a theme (the7) but whenever I enter the purchase code

” cUrl error 7: ” always pops up

I’ve also contacted the theme’s support team and directed me to a report of the website which says

“The7 Server Available: No Service is temporary unavailable. Please check back later. If the issue persists, contact your hosting provider and make sure that is not blocked.”

I’m not an expert in this field so I’d really appreciate any help!

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

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