Once you found RVssl Addon current version in WHMCS is different than latest version. Please don’t miss to keep your RVssl Addon updated with the following guide.

        A. In your WHMCS, open  “Addons” -> “RVssl” page. And click “Update Version” button, you’ll be required to enter FTP username and password to continue.

        OR

        B.

1. SSH to your server as root and run the following command to download RVGlobalsoft WHMCS Addon.

wget -O ‘RV_Manager_WHMCS.tar.bz2’ http://download.rvglobalsoft.com/download.php/download/whmcs_resellerbilling-package/

        2. Extract the downloaded file to WHMCS path in your server.

tar -xvjf RV_Manager_WHMCS.tar.bz2  whmcs/