[1.8.1 - 1.10.1] HopperGuidance

Does not seem to work. Don't have H button (also Enable Guidance/Pick Target) as in a video. Do I need some part for that? Also how do you actually install this mod? Tried placing whole HopperGuidance folder with _ folder in it. Then only _ folder into GameData. Button does not appeare either way. Also I am not 100% sure if this related, but MechJeb started to work differently, that is it won't show up unless I have MechJeb part on my vessel. So any ideas how to make this mod work?