There is no desktop version of the StreamMagic app available. The app is only available on iOS and Android mobile devices (smartphones and tablets).
You can, however, access the Webmin page for your Network Player by typing your Player's IP address into a web browser on your Mac/PC.
This will allow you to see your Player's network settings, device settings and device information, however you won't be able to access all of the features available on the app via the Webmin page.