Hi Stefan,
Unfortunately the "documents\chesspositiontrainer" folder did not contain a cpt_license.lic file. I also failed to manually find such a file elsewhere, as did the system (OK, I run Windows Shit.1 - euphemistically referred to as Windows 8.1 by Microsoft, so that system bit proves nothing). For purposes of orientation the folder, however, contains EXAMLEDATABASE.CPT, EXAMPLEDATABASE_BACKUP.CPT, MYREPERTOIRE.CPT and, obviously representing my efforts within the actual program, REPERTOIRE2015.CPT. Additionally there is an empty subfolder.
So there seems to be nothing to delete but nevertheless the box for entering the license code remains totally unresponsive to input attempts.
Would it help if I deleted all of CPT and reinstalled it? (Currently I have just one computer.) Losing the database(s) created with the not insignificant time of having created them would hurt but perhaps all of that could just be backed up. Whether reinstalling would be digitally interpreted as a renewed attempt at a free trial is beyond me. But so are most things computerish above end user level. So I will await your response, fully appreciating that you do not have time to attend to this forum continuously.
Regards,
Knightfall