I attempted a version update from 20.2 to 20.3 using the Avast UI. It failed (so I was told) so I repaired and restarted. Version 20.3 is now in use. I didn't intend that once the update had failed.
Are aesthetic updates to the GUI really necessary? They create additional scope for program use errors and add no value to the core function of Avast which is to ensure system security and safety.
Having read other user comments on version 20.3, I was surprised to find that my initial impressions are that it seems to work OK. The first system which received the bounty of Avast 20.3, a Windows 8.1 64bit installation on an ancient Toshiba Satellite Pro P200 with Core Duo T5550 processor is now more responsive, especially when using a web browser on newspaper websites. It had been quite sluggish but there is a definite improvement, albeit subjective. I write this in case there was previously a performance issue and user feedback is helpful.