Here’s a useful review covering Stardew Valley Compatibility Version Download — focusing on older versions, mod compatibility, and cross-platform needs.
Update: Steam will automatically begin downloading the legacy version. How to Download on GOG Stardew Valley Compatibility Version Download
The Cycle of Updates and Broken Mods The core issue driving the need for compatibility versions is the fundamental structure of game modding. Unlike official downloadable content (DLC), mods are user-created modifications that often rely on the specific underlying code of the game. When ConcernedApe releases a major update—such as the transition from version 1.5 to 1.6—the internal code of the game often changes drastically. Beta Participation dropdown menu
While downloading older versions solves the immediate issue of playability, it comes with risks. Downloading game files from unofficial third-party websites can expose users to malware, viruses, or corrupted files. It is always recommended to use official channels—like the Steam beta branches or GOG’s backup options—whenever possible. Additionally, playing on an older version means missing out on the latest quality-of-life features, bug fixes, and new content that the developer has worked hard to produce. It forces a choice between the stability of mods and the novelty of the official update. Unlike official downloadable content (DLC)
You can access this version through the "Betas" tab of your game client, provided you already own the game. and right-click on Stardew Valley Properties Click on the tab on the left. Beta Participation dropdown menu, select "compatibility"