For standalone mode try Minihost (http://www.tobybear.de/p_minihost.html)
I have the full version of TheGrand3, but i dont really remember the Grand3se. I tried the trial before purchasing the full version, and i think the differences are that the full version has more Pianos, more Microphone positions and better Quality (24 Bit vs 16 Bit). Not sure about all of these points, just compare the descriptions on the steinberg-site and you will see…