Maybe I'm blind - but i can't seem to figure out a) what you get when you pay for Dash on Mac vs download? Or b) why i can't use zeal on Mac?
There has been controversy in the past about the tool since it is a glorified man page reader. The author even shared at one point his earnings and what he is doing with it.
And no there is no zeal for macOS. I don’t know the details behind that deal. I can only say that zeal is not as good as dash. The integration into macOS is way smoother than what one gets on windows and Linux. I tried all versions.
You don’t need to build it yourself, there is a brew formula.