Hi all!
Been following this fantastic project for a while now, and thought it was high time to quit lurking and give some praise to Aztec and all the others who are contributing to it, carbide, doktor1 etc.
Massive rep to you guys!
The latest installment is definitely working with 8.1.
Here are some screens (sorry for the quality!), nothing fancy, just a sunrise at sea and a quick succession of screenshots to confirm that the clouds are actually moving. Blows my mind!
Stunnig work! Makes me load up random battles just to stare at the visuals. 
Can't wait for the new, colder climates, I'm especially looking forward to Aztec's take on snowy, foggy weather.