It looks like Curl is installed but still getting Curl not installed error
Command-line curl and php-curl are usually different packages. Assuming you're using unix you would do something like yum install php-curl or apt-get install php-curl. The exact command depends on what OS and version.

Or it might be installed, e.g. as part of the php-common package for example, but for whatever reason it's not enabled, in which case check /etc/php.d/20-curl.ini (the exact file/location depends again on which OS/version - it might even be directly in php.ini), and enable the curl module in there.