How do I upgrade from airi to airipro

I have built the site using airi, I just upgraded to airi pro.
Where do I put the license key?
i tried uplaoding airi pro has a seperate theme -theme installation failed, saying style.css not found.

thanks!
VJ

Hello there,

We’ve a guide to help you to do so, which can be read here:

Regards,
Kharis