I'd open the reader program and check for latest updates to see if there are any newer versions.
It appears that you are not using the free version, correct, as I am showing version 9.10.x is available? If so, then avast is doing it's job correctly but for some reason is not able to automatically update it for you.
Suggest manually updating the program and then rebooting. After that, open Software Updater (if need be, refresh the page) and see where you stand.
Cracked versions will never update properly and are a security risk to your system.