I Have Avast premier(A 3 PC License) on three PC’s at my home address.
Can I use my secure line subscription on all my PC’s?
Secureline is a separate/added subscription to Premier.
As far as I’m aware, yes you can use Secureline on different PC’s BUT NOT at the SAME TIME. 
OK Thanks.
It’s unlikely I would use it on more than one computers at a time. I was just worried it would cause problems inserting the license file on more than one computer.
No I’ve had Secureline installed and Licensed with Avast Premier on 2 LT’s at the same time. It was convenient as I wasn’t sure which machine I’d be using on Unsecured Networks.
But to be able to run Secureline on both at same time you would then need 2 Licenses.