So I just bought this game. I am trying to launch it from GoG Galaxy. When I click PLAY, there is a brief moment when the play icon changes, then returns to green and the game has not started. Basically, nothing happens when I click play.
Am running Windows 10 Pro. UAC turned off. Currently, only Malwarebytes running, and it's not that.
Any suggestions? I don't see a lot of useful info out there as of yet...

Running Windows 8.1 here and having a similar problem.
AHA!

https://www.gog.com/forum/stardew_valley/game_does_not_start_see_details_below

Follow the advice/instructions inside that link and see if that does it for you.

Weeellll frig. The XNA program didn't get installed with the game. Big oversight on whoever sets up the install process. It should be either automated, or a big box recommending that the user do it manually before or after the game's installation. *sigh*

Thank you for that reply, it sure helped!