Where do people find that google page? This is the 2nd or 3rd message I've seen, where people think that's where to get Inkscape. I'm not sure "back up files" is exactly what to call them. But it's probably better to get Inkscape from the official files on Sourceforge. Try starting on this page, to reduce all the clutter:
https://inkscape.org/en/download/They JUST released pre4, and I see they don't have Windows installers available yet, so I'd go with pre3. That leaves you with a choice of 32 or 64 bit. Both will work on a 64 bit Windows version. As far as I understand, using a 64-bit version of Inkscape on a 64-bit computer, will be a slight improvement in performance. But some of this technical stuff is a little over my head, so I might not have phrased that correctly.
I'm not sure what an MSI file is, so I shouldn't recommend using it, for the 64-bit version. But I can say the 7zip version should be fine, as long as you know how to extract a zipped file. If not, I can tell you.
But remember that these are still developmental or experimental. Some parts of it may not work well, or you may have more crashes than usual. Edit -- Actually, that might not be entirely accurate. Maybe pre-releases are a little more stable than developmental versions? I'm not sure
It's looking like (from observing messages on the mailing list) the devs are back on track, and building up to releasing 0.91, as it appeared was happening last autumn. At least, they said pre4 should be the last pre-release. Since the About screen contest has already happened, maybe it won't be so long.