It would be nice if Avast did what they sort of promised, make sure the last supported version for XP/Vista is bulletproof and this CPU cr4p with 18.8 forces people to go even further back to 18.5 (if they manage to get it).
I am not experiencing any CPU problems on XP with version 18.8.2356. The only trouble is that sometimes Behavoir Shield gets deactivated. But that has not happened for a long time.
You are fortunate as many did.
Yes, I suppose so. They could presumably fix this via microupdate if they wanted to. I did receive "support" after the end-of-life in the shape of the old SafeZone browser suddenly disappearing one day.
I rather doubt a micro update would do it, given that the final version is 18.8, that is the one they need to make bulletproof allowing people to move to the final supported version. Then it would be a case of downloading the full off-line installation file and installing it (whilst on-line).
But I'm not holding my breath. Add to that I have had an unrelated problem with my old XP system, one that I haven't got the time or inclination to find the fault (hardware) and resolve it (cash, which would be better spent on a new system)