There is a mod namend W3champions that only works for Reforged and give you Versus. Alternative you can do it like the other old school StarCraft Players and look for a patch 1.27b Private Servers because you can still download it here: Classic Warcraft III --- Official Installers - Official Patches
Or you go the prequel and buy and play it right now on sale here:
_https://www.gog.com/game/warcraft_2_battlenet_edition