well, you just need to change the ip locator api
edit /admin/whos_online.php and change to this (line 160):
//Function to get IP address geolocation data from IPInfoDB and update whos_online table
function updateIps($ips){
//Old,incesure method
//$d = file_get_contents("http://ipinfodb.com/ip_query2.php?ip=$ips");
//Initialize the Curl session
$ch = curl_init();
$URL = ("http://api.hostip.info/?ip=$ips");
//Set curl to return the data instead of printing it to the browser.
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
//Set the URL, then execute, then close
curl_setopt($ch, CURLOPT_URL, $URL);
$d = curl_exec($ch);
curl_close($ch);
//Use backup server if cannot make a connection
if (!$d){
//$backup = file_get_contents("http://backup.ipinfodb.com/ip_query2.php?ip=$ips");
$ch = curl_init();
$URL = ("http://api.hostip.info/?ip=$ips");