The only 100% legal way to obtain it is by purchasing used physical CD/DVD copies from sites like Amazon or eBay.
You cannot buy the game digitally through EA Play , Steam, or GOG. download-need-for-speed-underground-2-game-for-pc-free
While technically illegal in most countries as EA still holds the copyrights, many fans use sites like MyAbandonware or the Internet Archive to find the game. Installation & Modern PC Fixes The only 100% legal way to obtain it
If you get an "Insert Disc 2" error, create a blank text file in the game folder, rename it to exactly FOOBAR (delete the .txt extension), and the game should launch. and the game should launch.