1º Learn coding.
2º Don't ask people to do it for you.
3º Don't clam as your own.
4º Learn coding.
Well, just with some basic you can make an easy trial
Like, using program settings and set like a max of 30 days.
And you make the setting as an integer that holds the value of 30.
And on the startup or for the next day, you degrease the value by 1.
And when it reach 0 it will say that the trial is out.