when ms quits updating in october will avast be able to help?
First, I’m an Avast user and not an Avast Team member.
Avast will still support Windows 10 (e.g. Avast will still run on Win 10) - Avast has form for supporting older OS versions for some years after MS stopped updating them.
You question is a bit vague, if the above answer isn’t what you are thinking of, you will have to clarify.