You could try this:
1. Close PT4
2. Navigate to C:\Users\[WindowsUsername]\AppData\Local\PokerTracker 4\Data\AppsData
3. Rename the Tm90ZUNhZGR5 folder to something like 'Tm90ZUNhZGR5 backup'
4. Restart PT4, you should be prompted to go through the NoteCaddy Setup Wizard
5. Go through the wizard, and then make your NoteCaddy settings as you prefer, and if you need to import any definitions from your 'Tm90ZUNhZGR5 backup' folder