Green Hilltop: Should I install it or is it already included in the games, given that they have a higher version than the patch?
If your installer is version 1.x then you should install the universal patch. If your installer is version 2.x then the universal patch is already included.
Green Hilltop: Did any of you install the normal patches from Sierra on top of that or not?
All official Sierra patches should already be included. There may be a few special cases when you need to modify a few things, but far and few between. So no need to preemptively install any other patches.