Please manually download and install PostgreSQL v10.22 for Windows x86-64 from here
and for the two password boxes use 'dbpass' (no quotes) which is what PokerTracker 4 uses by default. If that installs successfully try starting PokerTracker 4 again but if that PostgreSQL install does not complete successfully then in Windows open File Explorer and enter the following in the address bar:%localappdata%\Temp
In this folder there should be a file called 'install-postgresql.log' - please attach that file to a Support Ticket
so we can follow up on this with you.