Question on SC License Extension

I have both SC 8.1 and 9 separate installations (as I’m sure most of us do) and license is due for renewal. I just want to be sure of 2 things before I proceed:

  1. If I buy the extension for a year, does the payment cover both 8.1 and 9? I imagine so but need to be sure.

  2. If I upgrade my version 8.1, will it upgrade to the newest 8.1 or will it convert my 8.1 into a version 9 installation?

I’ve tried to chat with sales on scriptcase.net but after the initial bot answers, no real person is responding.