You are running Windows 7, Windows 8, or older 32-bit versions of Windows.
It allows users on 32-bit operating systems or older versions of Windows and macOS to play the game without upgrading their hardware. Stardew Valley Compatibility Version Download
Massive mods like Stardew Valley Expanded or specific SMAPI frameworks take time to update after a major game patch. The compatibility version keeps your mods functional. You are running Windows 7, Windows 8, or