Effectively this is how it is (especially in the older versions of Avast), you get one years and you have to renew (even though avast are saying there is no requirement).
So why you're getting a renewal notification (if that is really what you are getting) I don't know, but I suspect not based on your first post Reply #144 on 06 July 2019
<snip quote>
Mine expired today. The registration button is redundant.
I'm using XP, SP2 and Avast 9.
So it shouldn't be required until 06 July 2020 (if you managed to renew at that point), so something else is going on.
This may be a program related problem as your shields should still be working (as mentioned previously) even if the registration was expired.
I suspect this may be more to do with your OS version (why not move to XP SP3) and Avast version 9. Are you able to update to XP SP3 which would probably allow you to update to Avast 10 or possibly later.
There are so few people using XP SP2 and Avast9 for anyone to be able to remember its interface and actions.