Hi Nori-chan,
Yep, I think that (double-clicking the license) is the way to go. It helps if you are also connected to the Internet when you do this.
What do you want to change about the license? What would be different about license configuration for you?
The only thing I would change is that even if Avast already have a license for the VPN (or anything, in my opinion), I should be able to switch between licenses, or just remove them to use in another device.
If I could just do that, then I would just switch them only by clicking on a button "Switch license"
And since each license should be used by 1 PC, what if I buy another license and want to use the older one in another computer for whatever reason?
Or maybe, I buy the CleanUp tool and activate it, but I want to actually use it in another computer.
That's is just what I think.