macOS 10.15 Catalina introduces additional security requirements which affect PokerTracker 4.
These security permissions are required for proper import and Hud operation.
In order to be able to import your hand histories as you play PokerTracker 4 needs access to the folders where these are saved - specifically the Documents and Downloads folders.
For the Hud to be able to track the poker site windows and place a Hud on them PokerTracker 4 needs access to Screen Recording.
Note: PokerTracker 4 does NOT actually record your screen - this permission is required in order to be able to locate the poker site table windows and overlay the Hud.