Can I upgrade license?

I bought a lifetime BTT license recently; is it possible to upgrade the license for an additional computer? I think I only selected 1 seat cause I was using my MacBook Air at the time but later realized I would also like to set it up on my Mac Mini with wireless trackpad.

correct, you don't need to upgrade your license is already valid for all your machines.

Oh thanks for pointing that out, I tried searching first and somehow I missed that when I read that section.