There's an apology coming...
So I'm using NOD32 Anti Virus 7.0.302.0, it is already the latest version. Upon receiving the desktop prompt, which was offering Eset Smart Security as a free upgrade, that didn't appear to be free at all, I jumped on my soapbox, megaphone in hand...
The truth is, for me, it would be a free upgrade because I have a three year ESS license. So, I apologise for the noise and will get back in my pram!
I use NOD32 AV because Smart Security gave more trouble than I was willing to troubleshoot, and at renewal time, there's no path to downgrade, and the ESS renewal fee is still cheaper than a new NOD32 subscription.
Boy, I sure wish I'd sussed all that out before wasting everyone's time with this... deary me!