Got curl_init() error when trying activating license

Make sure your PHP setup supports curl.

curl_init()is a PHP core function since version PHP 4.0.2 (https://php.net/manual/en/function.curl-init.php). We do not support PHP lower than PHP 5.4.

If your setup is missing this, then some extension or library must be missing in your server, read the following links:
https://stackoverflow.com/questions/2997040/curl-init-undefined
https://php.net/manual/en/book.curl.php