Please download the zip-file for the mod as it is, and place it in your 'mods' folder. For some web browsers
the ZIP-file will be stored in a folder called Downloads. You can copy the ZIP-file over to your 'mods' folder.
Usually for Windows-based systems, the mods folder is located at 'My Games > FarmingSimulatorXXXX > mods'.
Please do not unzip the file even when some of these mods aren't made for multiplayer. Farming Simulator will read ZIP-files directly.