Since version 1.12.1 is no longer officially supported by Blizzard, you must obtain it from third-party community sites. Download Sources : Most private server communities (such as Elysium Project
If the game starts in a tiny window, go to System > Video in-game and check the "Windowed Mode" or "Maximized" boxes. WoW Vanilla Client 1.12.1 Portable Download Pc
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The 1.12.1 client, known as "Drum of War," represents the final state of the original game before the Burning Crusade expansion launched. Portability Since version 1
If you are looking for a community-vetted version, many players use the Elysium Project Kronos WoW known as "Drum of War