Ah it's no problem. [link] The newest version is: 1.4@MikuMikuDancei64bitOS Verj but I have the 1.3 MikuMikuDance (DirectX9 Ver.) Which probably works just as well, they're the two best versions so it's your choice which one you want c:
Scroll down to either MikuMikuDance (DirectX9 Ver.) or MikuMikuDance(x64 Ver) and click on the highlighted blue link to download the one you want.