Fix for "String could not be parsed as XML" in server part of aps installer.

server/lib/classes/aps_installer.inc.php

@@ -555,6 +555,7 @@ class ApsInstaller extends ApsBase
 			curl_setopt($conn[$i], CURLOPT_TIMEOUT, 0);
 			curl_setopt($conn[$i], CURLOPT_FAILONERROR, 1);
 			curl_setopt($conn[$i], CURLOPT_FOLLOWLOCATION, 1);
+			curl_setopt($conn[$i], CURLOPT_SSL_VERIFYPEER, 0);
 
 			curl_multi_add_handle($mh, $conn[$i]);
 		}