Marco here! http://www.racedepartment.com/2012/01/motec-plugin-available-for-rfactor-2/ on racedepartment, then i switched into isi forums but couldn't locate the password, second download link is down i found on motec site i2pro and i2standard but i don't know it's something additional application to work with plugin or not. I just dont know if i need both or only plugin
Try this http://isiforums.net/f/showthread.php/3336-rFactor-2-Motec-Plugin
You'll find instruction on how to install and yes you need the plugin for rFactor 2 made by Lazza and the i2pro software.