It is a simple. Hyena saves Timestamp of installation in two places. It runs 30 days as shareware. I found identical Timestamp record twice.
If you set Timestamp as far future you will get nice message – “Days remaining for use of this licensing key: 19263”
c:\WINDOWS\system32\lvntwiz33.inf HKCU\Software\Adkins Resources\Hyena\Win32\EvtLogQueInterval