If PostgreSQL is still installed on your computer, go Start -> Programs and look for PostgreSQL (version) to determine the release version of PostgreSQL installed on your computer. You can determine this via several methods: If PostgreSQL was previously installed on this computer then it is imperative for you to know which major version was installed, for example PostgreSQL 8.4.x or 9.0.x.
You use PostgreSQL 9.3 at your discretion as of PokerTracker 4.11 provided that you manually install PostgreSQL 9.3 and migrate your databases to this new server version. PokerTracker's developers and support team recommend PostgreSQL 9.3, although there are no signifigant performance improvements if you already have PostgreSQL 9.0 or higher. This guide will help you to manually install PostgreSQL 9.3.
