NSIS Error (492432)

I’ve asked this question before, but I’m not getting a reply…

I downloaded Unity 3D v4.0.0 but when I try to install it, it performs a self-check, and says NSIS error:

The problem’s with monodevelop. Can I set it up separately? I can install Unity without Monodevelop, but can I install the Monodevelop for Unity without the whole thing?

Can I use some other debugger software with Unity?

I’m on Win7 64bit / 32bit

Why do I get NSIS Error? - NSIS got to this site it wil help u