Offline version

Some time ago they stopped offering it, but recently I believe it is back.

This one was for the Avast Free version 26.2 release, that said the link generally downloaded the offline update for latest/current Avast Antivirus Free version.

There is also a link in that topic for the off-line installation for Avast Premium.

I’m not sure what you mean by this comment ?

I’m able to manually update Avast Antivirus Free that I have been using for over 20 years
So what errors are you getting ?