I updated, but apparently not to version 4. It's still 3.8.3.
In any case, I can understand how a free piece of software would advertise while being used, or while providing some clear benefit at that time (like Avast, which offers some realtime protection), but for a software to pop up ads while it's running in the background, mainly because it's actually annoying to turn off while not in use (due to admin privilege shut down requirement)... feels a bit too pushy, and certainly too annoying for me to keep evaluating via the free version.
I leave this as my opinion/feedback, in case it helps to balance your software's user adoption with sales' apetite for upgrade conversion 😃
Thanks for the clarifications.