Go to Slippi.gg and download the desktop app.

If your goal is to play Melee online with rollback netplay, Slippi is the industry standard.

. If it is smaller, it might be in a compressed format (like .rvz or .7z) and may need extraction via How to Get It

If you are unsure of your version, most modern launchers like Slippi will notify you if the ISO is not the required v1.02. System Specs: