Well I guess I can take back what I previously stated. I have come up with a new working method to set up multiplayer for Renewal. It should work for anybodies games, but it's going to very 'intact' with Renewal, and therefore I would only be able to explain the process and probably not upload it as a set to to use.
If anybodies wondering for their own use, try POSTing data to a PHP file that is hosted online as well as a TXT file that is hosted online, then you use the PHP through stencyl to constantly update information such as a players x & y co-ordinates and which direction they are facing etc.
If this electrotank multiplayer kit is still working for you however, stick with it because it is alot easier to use. My method is being used just so I have complete control and knowledge over what is happening!
-Tgb