What device are you using? I would assume a Android of sort. If you can download the addon with the device instead of the computer that would be better. Not all devices can do that. If you have a Fire Stick you can only do this with your computer and you will need ADB Fire (I believe it is called).
If you are downloading an addon it tells me that it is not supported here. If it were and your device was setup IAW our forum and Fusion, you would not have to download the addon on your computer. So what is the addon? Do you Have fusion on your device?