GuzzleHttp\Exception\RequestException: XenForo upgrade check failed: cURL error 60: SSL certificate problem: certificate has expired (see https://curl.haxx.se/libcurl/c/libcurl-errors.html)
src/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php:201
I don't know how to solve it
I know how to use Putty, I know what command line in linux and Putty is, but i dont know if xenforo have it own command line. Many software or games or interfaces have a command line, that is why I hace a mess if people just say " command line ".