Hello. I am using Avast Linux Home Edition v. 1.3.0 without issue until a few days ago, when suddenly the virus updates stopped. I’ve tried manual and automatic update settings and a fresh program install to no avail (still only updates to 3/23). Ideas are appreciated. 
P.S. I tried a manual VPS download but it only comes as a Windows executable.
Hello,
You are using an obsolete unsupported program version, that is no more maintained for several years.
The current Linux products can be found here: https://www.avast.com/linux-server-antivirus.
(Note, that those are all server products, there is no “home” version for Linux)
Well, it was unofficially supported until March 23 when Avast changed something on a server that stopped feeding it updates. But, no matter. I’ll just appreciate the 4-5 years good service I got from the product. Thanks for reply.