You'll need to download the correct "client" version of VentriloPro for your operating system and processor type. If you are unsure of what processor type you have, just use the x86 version.

Run the installer from wherever you saved the setup file. It should add a VentriloPro icon to your desktop.

Run the Ventrilo software either from the icon on your desktop or from your start menu. You will be greeted with a prompt to Import your Current Ventrilo Configuration.

If you import the old settings, it is important to note that the VentriloPro Client can not connect to any existing Ventrilo 3 Servers.

Click on the "User name" button at the top left of the client.

Click the new button. A window will pop up where you can enter the username you want others to identify you with when you log onto their Ventrilo server. Click ok to return to the "Setup User" box. It should show your new username in the top left. Click ok to continue.

Click on the "Server" button, right below the "User name" button you clicked on to setup your username.

The "Connection Editor" will open in a new window. Click the new button. A window will pop up where you can enter the name you want to use to identify the server you're trying to connect to. Enter the server name and click ok, which will return you to the "Connection Editor".

Click the Connect button on the Toolbar of the VentriloPro client