Look for used PC DVD copies on marketplaces like Amazon or eBay.
There are patches available to update the visuals and UI to match newer titles like EA FC 25.
EA are shutting down the servers for fifa 18, 19, 20 and 21 on November 6. PC/Origin FIFA 18 DOWNLOAD HOOLABALOO MEGATHREAD
EA officially shut down the online servers for FIFA 18 on November 6, 2023 . This means even if you have the game, Ultimate Team and other online modes are unavailable.
Sites like ModdingWay or FIFA Infinity provide unofficial squad files to keep rosters up to date for recent seasons.