Unable to turn VPN on (Grey zone) from release 25.17 of Avast One free
First, I’m an Avast user and not an Avast Team member and I don’t use the Avast One product.
However, I believe that the Avast SecureLine VPN is now a stand alone VPN product that you can purchase to run with what ever Avast Antivirus product that you have.
I did a google search on this - Avast+SecureLine+VPN - which returns many hits.
See this one in particular.