Can't install WhatsApp on Windows 8?

I’ve been trying to get WhatsApp running on my Windows 8.1, but I keep hitting this wall where it keeps nagging me with "switch to a Microsoft account on this PC".
It’s driving me a bit crazy because I had zero issues getting it installed back when I was still using Windows 7, so I don't really get why it's being such a pain on Windows 8.

I had zero issues getting it installed, seriously. Do you actually have a Microsoft account set up? Because if you didn't know, you can totally just log into Windows without one, plus everything else too.
So, just try right-clicking in the bottom left corner, then head over to settings>pc settings, and under the accounts section there should be an option to switch to a local account... I'm not 100% sure on the exact wording since I just use a standard account like what we used back in Windows 7 or XP, nothing involving all that online stuff Microsoft keeps pushing on us.