We use the try-buy version but have no way to contact you and add users pay you and so on...
could you tell us how you suppose to continue with this plugin?
do you plan to earn money from it and support it or only let it be... free but half-working?
I know at least five ways of contacting me exposed through either plugin homepage or page of free version.
I don't understand what do you mean by half-working.
Currently the service is free for all. I provide only minimal support. Though you may pay for it through http://msgnotes.alehro00.com/perm1/subscribe.html.
There are some bugs in site's user add procedure. If you need to add users please let me know.