"Mario Kart: Double Dash!!" is a racing game developed by Nintendo for the Nintendo GameCube. It was released in 2003 and is the fourth main installment in the Mario Kart series. The game is known for its innovative gameplay mechanics, colorful graphics, and extensive character roster.
If you want the safest, easiest route: Buy a used GameCube disc on eBay ($40-60), rip it yourself using a Wii homebrew app called "CleanRip," then use Dolphin’s "Convert to RVZ" function with compression set to maximum. You’ll get a legitimate, 130MB file that you own legally. Mario Kart Double Dash Highly Compressed