You can download the setup file from the following URL
When the setup is downloaded, just execute the program and follow the steps in the wizard.
If the .NET framework 4.51 (or more) is not installed the setup will automatically prompt you to download and install it. This is a requirement. Without it the program cannot be installed.
Once installed, by default the setup automatically starts the program but you will find a link in the start menu or the start screen to start it later.
Next step: load your first log files