Run the installer. It is an .msi file with a name like Soundpad_x64-1.1.0.msi.
Then follow the installation wizard.
You have to accept the license terms in order to continue.
Select an installation directory or keep the default.
You may choose to let the installer create a desktop shortcut to Soundpad.
A start menu shortcut will be created automatically.
Administrator privileges are required to install Soundpad.
By clicking on install you will see a prompt to allow the installation.
Soundpad has been installed successfully. You are almost done.
A system restart is required to complete the installation.
If you choose No and start Soundpad before a system restart, you will be able to work with the soundlist and many other things, but you won't be able to use the main feature, namely playing sounds in voice chats.