Download and install .37 first, then install .38. Then I think you have to click no when it asks if you want to delete the older version of the game. Then you should have both versions.
It seems like a good idea. But with freestyle it should be a bit stricter. Like everyone is going to post their best freestyle they recorded. So I don't know.
Name: Joseph Solis
AIM: joesolis16@gmail.com
Truck: Monster Energy 2015 (Damon)
Link: http://sim-monsters.com/index.php?/files/file/1884-monster-energy-2015/