If you want a clean, working version of the game, it is frequently available for very low prices (often just a few dollars/zlotys) during sales on official platforms:
Searching for free versions of paid games often leads to "abandonware" sites or unofficial mirrors. Here is why you should be careful: Farm Mechanic Simulator 2015 do pobrania za dar...
The most reliable source for digital copies, featuring cloud saves and easy installation. If you want a clean, working version of