PokerTracker

I am a previous user pf PT2, so I downloaded the trail version of PT3 without postGRESQL as instructed. When I try and use the trial version, I'm being asked for a password to configure postgresql which I have no idea where I get one for the trail version.

Do you already have postgres installed - were you using it with PT2?
If so, you would need to know the password you used when you first installed it. If you don't know it, you can remove the need for postgres passwords: How To: Remove PostgreSQL Password.

If you don't already have postgres installed, then you will need to install the 'with postgres' version.