There was a one time lifetime payment.
Are you sure you NEVER offered it ?
I use Windy almost everyday, I love it. However, I just noticed that my Premium "crown" is missing. I noticed this when I tried to access the 3D rendering and was offered to pay again. Well I'm not going to do that since I've already done it once :-)
So I'm concerned that maybe changing my email or something caused this ? I don't want to offer that information in a public form so if there's a way to contact privately.