Did you terminate the update process or did your computer go to sleep? If the database update was interrupted then that database will not be in a usuable state. To resolve it if your database isn't that large you can try a full cache rebuild via 'Database -> Database Management -> Rebuild Cache -> Full Cache Rebuild' but make sure your computer doesn't power off or go to sleep until that process has been completed. In the meantime you can also start a
new database and reimport some of your newest hand histories - that would allow to continue using PokerTracker 4 at the tables and schedule the cache rebuild on the original database for another time. Just do not uninstall anything as that can just make things worse and can result in you losing your data.