1.27b is a good version and one I still use, because it’s practically the same as the last original version (1.26), but with some compatibility updates for modern systems. Classic Warcraft III --- Official Installers - Official Patches
But I know many people want a later non-reforged version than that such as for actual widescreen support or 24 players/colors. You can actually install a backup copy of such a version, but you may have to delete Reforged and block it from automatically updating to Reforged. There’s a link from that thread on how to do it for v1.31.1: _Patch 1.31.1 Backup Files | HIVE