PT4 Not Finding Full Tilt

You should have a look at this guide: https://www.pokertracker.com/guides/PT4/site-configuration/full-tilt-configuration-guide

To double-check your PokerTracker4/Full Tilt configuration you need to:

1) Be sure when installing Full Tilt that you choose "English" if offered the option;

2) That in Full Tilt you've set "Save my hand histories" under "Options -> Instant hand histories..." and note which directory Full Tilt intends to put them in, then

3) Once you enable that option play a couple hands at a table (without PokerTracker4) so that Full Tilt will create that folder;

4) Using the guide I linked above be sure that the directory PokerTracker4 will look for new Full Tilt hands in is the same one you noted in step #2. Use the "Add" button, not "Auto Detect".

Also while on that tab make sure the "Get Hands From Site While Playing" has a check mark.

And if this is for Rush games you'd want to see this section of the guide above: https://www.pokertracker.com/guides/PT4/site-configuration/full-tilt-configuration-guide#enabling-the-rush-poker-hud

Then after taking a seat, click "Play Poker -> Get Hands While Playing" and you should see your hands being imported (and the HUD appear shortly after).

Incidentally you could still see a "not installed/configured" message but if things are otherwise working now you can ignore the message.