Hi,
Just wanted to see if many people are getting the same issue, which is easy to resolve.
Avast Free Version usually updates the program and Virus Definition automatically, though recently a few people ive delt with when performing the Avast Program update says "Update available" though does not install it. Plus you are not notified to say a program update is available, even though Avast says "you are protected", cant be if it needs a Program update that wont automatically install
The resolution i found is download the installer and let it re-write.
For people who do not check this, or notified that the Program version is not up to date, this could be a problems and thought id address it for Developers to look into.