Hey,
I purchased US2 just a few minutes ago. I installed it (all over steam, also the purchase) and then I tried to start the application. For some reason, the game says me "Steam Required: You must be running Steam to use Universe Sandbox. Launch Steam and then restart Universe Sandbox." I clicked on the okay button and the game closed. I restarted Steam, logged in to my account (I bought the game with this account) and restarted the game... Same Error.
what can I do?
I am playing on Mac OSX 10.9.5