Please reboot after any (re)installation or any repair of Avast.

Downloading the full update as you asked is not a solution for your case. The normal update is between 10 and 300 KB, and the full update you asked for is 40MB.

A repair and reboot solves the problem in most cases. A server problem is also a possibility, but then you should wait several hours and try again to be sure.

Remember to reboot (it is needed in most cases to show the correct definitions update with cases of synchronization problems like yours). Most probably tomorrow you will discover that this is just a one-time simple “glitch”.