Exactly, and nothing wrong with this situation at all. No one can expect that avast! license will work properly if your CMOS battery is dying. We all know that if your battery power is weak, your system clock will start messing your time because system clock is powered by CMOS battery. If your clock is not showing proper time, of course avast! will start complaining about the expiration of the license. That's the only logical thing in here.
This particular customer should not blame avast!, Alwil or av-outsource for that matter... he should have contacted his hardware service department to solve this problem at the root level. Once he replaces his CMOS battery, avast! registration will go flawlessly even if he uses this same key av-outsource have sent him.
I guess he didn't know much about CMOS battery problem, so he started panicking. It would help in the first place if he just posted a screenshot and have checked his system clock like someone else already suggested in this same thread.