You can find official legacy installers for versions like 1.31 (the last version before the Reforged update) through the Blizzard legacy download portal. 2. Alternative "Free" Trial and Community Versions
For those without keys, some platforms offer "trial" or archived versions, though online play on official servers is restricted. You can find official legacy installers for versions like 1
If you have your original and The Frozen Throne CD keys, you can redeem them on your Battle.net account management page . navigate to "Account Settings
Log in to Battle.net, navigate to "Account Settings," and enter your legacy key. " and enter your legacy key.