On developer page you can see this message for the upcoming update 1,0
Nice! I’ve been using REX Weather Force 2020 for about a week now. Pity MSFS2020 is currently unplayable at the moment though, due to constant crashes… 
Is the weather changing smoothly now?
If you remove everything - absolutely everything including REX from you community folder, do the crashes stop? Just asking.
I’ll have a look into this today…