Simply does not work as intended.
I've used several other video converters in the past and none of them failed to convert from .mkv to .mp4, even with a free version. Followed the online tutorials in case the rudimentary skills needed to figure this thing out were somehow not enough. This program recognizes the videos, and can play them, so you would think Any Video Converter would be able to at least list a reason besides the "AVC failed to convert...try again later" message. Not shelling out money for the full version if this is what I can expect. The company offers a free license for a positive review of 4 or 5 so consider this when reading any of the overwhelmingly excellent remarks.