We have a guide for getting things setup with partypoker
here. To double-check your PokerTracker 4/partypoker configuration you need to:
1) Be sure when installing partypoker that you choose "English" if offered the option.
2) That in the partypoker lobby you've enabled the "Store hand history logs" option via "Options -> Advanced".
3) In PokerTracker 4 go to "Configure -> Sites & Import Options -> Site Configuration -> partypoker". Make sure that the directory PokerTracker 4 will look for new partypoker hands is this:
C:\Programs\PartyGaming\PartyPoker\HandHistory
If necessary use the "Add" button to manually select that folder and once that is setup you can test this by clicking "Play Poker -> Get Hands While Playing" and after playing your first hand you should see that get imported.