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How do you get the windmill? I'm level 67.
Can't you see it in the upgrades?
I'll add a screenshot within a few minutes,if you don't know where to find it.
Below the game at the right side you'll see this button,(the one with number 1):
Click on it ,then on blue button:
Then look for the windmill,it's the 6th button from the left (mine is showing a bit strange today)
According to a site I went to it said you have to have 700000 coins and 173 favors to purchase.. The townfolk will help you build it and you add 2 furnaces to it to get it started.. It starts at lvl 35 and you are way above that..