You should download and install Visual studio 2015 community (it's the free version),when installing select to customize the installation and deselect everything, so you'll install only the things needed to building desktop apps, then download the source and open YATA.sln, to compile it press the Run button on the top of the visual studio's window, if you need a more detailed explanation pm me
Yes, you can, also if it's a very old pc i think (based on my experience on a netbook) windows 8.1 runs better than 10