To install BrickPlanet, click the Install Launcher. Once the launcher has been downloaded, your browser may display the file in its downloads section. Open the downloaded file to begin the installation process. You may be prompted to install Microsoft .NET, a software framework required for BrickPlanet to run. Follow the on-screen instructions to complete the .NET installation. Once the required components are installed, BrickPlanet should be ready to launch and play.

(I did not copy this from an external source, only my owned group when it used that to help people.)