Oh, it's still trying to update, even if you replace the mpq manually. You can try restarting your computer to see if the launcher will download properly, or if you're comfortable you can go into your registry by opening regedit, and going to HKEY_CURRENT_USER\SOFTWARE\Blizzard Entertainment\Diablo II and change AnnihilusVersion to 4.1.3, this will prevent the automatic update.
and fantastic job mate. only grumble is you nerfed my army . bad game baaaaadd. lol
Give the respect you expect.
Update via launcher worked just fine for me. Verified by relaunching and checking for frag bag at gold vendor. Cheers!