Depend on if you are native speaker or not and if you still want to do Versus or not.
If you want to do Versus, keep it and install https://www.w3champions.com/
if you just just want to play Singleplayer campaign on best graphic in your language but without reforged problems keep it until you installed the 1.31.1 version fromhttps://www.hiveworkshop.com/threads/patch-1-31-1-backup-files.322083/ and then ask for a refund.
If you are native english speaker you can skip this step and ask right away for a refund.
If you just want to play the game from back without DRM or any questions just refund it and install it from here: Classic Warcraft III --- Official Installers - Official Patches