Should I download it? Does it make a difference?

I just went from 3.0.3.8 to 3.0.4.0. I don't see why not. I was running the alpha 64 bit version so this version must be better. "64bit windows platform is now an officially supported platform (rather than being Alpha)."

Changelog is found here.

It's a forced upgrade I think anyway.

Get aaaaaaafter it