Follow the instruction outlined in the Adobe Experience Platform documentation to install the psql client:
PSQL Install Guide
Only for Windows users
Make sure that you install the exact version of npgsql as mentioned on the document, otherwise you will not be able to connect Power BI to Adobe Experience Platform Query Service.
For Windows or Mac users
Install Tableau Desktop as per the documentation.
Tableau gives you a 14-day trial period automatically.
If you want to use Tableau beyond those 14 days, you’ll need a license key.
Next Step: 7.1 - Getting Started