I realize this is a long shot, but...
Most, if not all, 30 day trial software lasts for 30 consecutive days, whether you use it or not.
My problem is I am not always at my computer. Life gets in the way and before I know it the 30 days is up and I've barely used the program.
My thought to remedy this is to make a 30 day trial last for the actual 30 days you use it. Each day you use it, it logs that day whether you use it once or 50 times in that day. If you only use it one day a month it will last 30 months. That way you are guaranteed 30 actual days of use, not 5 or 10 like in my cases.
Just a thought!
Steve