My system running OBS clasic just died, and running a new machine with Win10 I'm having the same issue. DirectX won't install properly so I can't install OBS Classic. I bit the bullet and downloaded studio, and I've gotta say there are many features I'm used to having at my fingertips in Classic, that are either nonexistant in Studio, or buried somewhere that I can't find them... Chromakey? Scrolling Text? gone... I'd much rather stick with Classic if someone can figure a workaround for this.
EDIT: And no, that installer you linked doesn't solve the issue. It's the same one the OBS installer points you to that won't install on Win10.