Hi!
As you might know, Goat MMO Simulator will be a completely free update for everyone who owns Goat Simulator, and will be patched into the base game.
For those who don't know what I'm talking about, here's the trailer: https://www.youtube.com/watch?v=WAm5yxQA_HY
This means that the current Goat MMO Simulator storepage is pretty unnecessary (right now we're just keeping it there to show you guys the trailer, screenshots, new features, etc.).
Once the update goes live, we'll remove the Goat MMO Simulator Steam store page. Once the page is gone, your Steam client should already have downloaded the update.
To recap: you won't need to buy or add anything else once the update goes live (should be around noon EST) Just let Goat Simulator update and you'll be able to jump into the Goat MMO Simulator expansion!
Hope you guys enjoy! :D