Once VirtualMoney has been purchased and downloaded, you can install it like any other Joomla component.
To access the zip folder of VirtualMoney, you need to unzip the file you just download, the component will be inside it.
Go to the 'Extensions' menu and choose 'Extension Manager'
Choose the installer file in the first field and choose Upload & Install.
The component, modules and plugins will be automatically installed. Once installed you should see this view :