Very nasty to do this, specially before Christmas.
Licenses don’t expire.
Can you explain a bit about what happened that makes you think yours did?
My eMclient started as usual when I switched the PC on this morning, but emails from my main account did not download.
The message was - expired licence.
That is not a nice thing to face when you are in hurry and quickly checking for overnight emails.
Anyway, everything is OK now, I got a new activation key and all works OK.
The eM Client license doesn’t expire. Can you give a screenshot if it happens again as it may be from some other app.