PokerTracker v4.15.27 has a small database update which shouldn't take very long. It is normal for PokerTracker 4 to be unresponsive while this is going on but if you are having trouble starting PokerTracker 4 then please
enable logging, reproduce this problem and then send your log file to us in a
Support Ticket:
C:\Users\{Windows Login}\AppData\Local\PokerTracker 4\Logs\PokerTracker4.log
If you do not see the AppData folder in Windows File Explorer then please refer to
this guide.