The wow-update-51enus.zip file you have requested: Official Patches / v51 / World of Warcraft v5.0.5b to v5.1 Patch (English/US) - 577.14mb is not available. Perhaps try browsing all files for the game World of Warcraft and upload any files you want to share or are missing. This is the only information we could locate:
This patch will update World of Warcraft v5.0.5b to v5.1. The Pandaren Campaign beings with the latest major content update to World of Warcraft.