PI2 installation and used

HI, i have a PI2. I already use it with domoticz and i want to use it too to build multiroom with ip player (omni 20 harman and kardon). I dont find how to install volumio whithout using img. Does someone know where i can find the packets? Then does someone know if i can use volumio to do what i want it means playing music on my ip player directly (without having volumio client on a PI connected to the player)? thanks a lot for your answers