Before the installation, see the topic System Requirements first, and then do as below:

Find the setup package you have downloaded from the website in your PC, double click to run it.

Follow the prompts to finish the installation procedure.

After the installation, there is a shortcut created on the desktop. It will be shown , and you may click to launch it:

There is also a menu group "Wave Expert Audio Editor" created under the programs. See it from "Start > Programs >Wave Expert Audio Editor".