As the night wore on, Alex grew more frustrated. He didn't want to risk downloading a virus or malware onto his console. Just as he was about to give up, he stumbled upon a Reddit thread discussing FIFA 18 ROMs for the Switch.
Downloading ROMs can be risky and potentially illegal, so I would advise against it. Instead, consider purchasing a used or discounted copy of the game, or waiting for a sale on the Nintendo eShop. fifa 18 switch rom download link