Once you’ve obtained the legitimate 1.5.6 installer (ideally the GOG offline backup), follow this guide.
To download on PC, you typically need to use the "Betas" feature on Steam to revert from the current version (1.6 or later) to the stable Legacy 1.5.6 branch . This is commonly done for mod compatibility or for players who prefer the previous major update's features. How to Access Version 1.5.6 on Steam stardew valley 1.5.6 download pc
1.5.6 fixed most co-op bugs, but ensure all players are on using the beta branch method. Mixed versions cause disconnects. Once you’ve obtained the legitimate 1