I should structure the answer to cover these possibilities: where to get the key (official sources), how to activate it, and troubleshoot common issues. Also, maybe highlight the game's educational purpose and John Deere's message behind the game.
: Some players find success locating original digital files on heritage gaming sites like the Internet Archive PCGamingWiki john deere drive green game activation key
If you already own a physical copy and lost the key, contact the seller or publisher with proof of purchase. I should structure the answer to cover these