Make sure each mod has its own subfolder, without trailing numbers. To install a mod, just unzip it into the Mods folder in your game folder. Not there? Here are some other ways to find it: Steam: ~/Library/Application Support/Steam/SteamApps/common/Stardew Valley/Contents/MacOS GOG: /Applications/Stardew Valley.app/Contents/MacOS Steam: ~/.local/share/Steam/steamapps/common/Stardew Valley Steam: C:\Program Files (x86)\Steam\steamapps\common\Stardew Valley GOG: C:\Program Files (x86)\GOG Galaxy\Games\Stardew Valley Here’s where to find it by default: Platform
Next you’ll need to open your game folder (the one containing Stardew Valley’s.