I saw your first screenshot of that, my point being it is difficult to help when using an old version.
Mine was to show how it as changed.
The second screenshot is not from the AvastUI, but the Avast Account:
Have you tried to connect to your Avast Account as I suggested.#
I don't know if you have checked your Avast Account id.avast.com if you are logged into the forum it should recognise your account. There is a Manage My Subscriptions section. Attached image 2.
I don't know if this would even be linked to your old version 17.5 or not.
But the Avast Account function has been around for some time now. It is effectively use to enable you to log on to this forum.