If you do not have a WinTV v10 Activation Code, you can purchase a new WinTV v10 Activation Code on the Hauppauge webstore. This only applies to unused WinTV v8.5 Activation Codes. If you have recently purchased a new WinTV product and it came with a WinTV v8.5 Activation code, you can install WinTV v10 with this code. So as long as you use the same Hauppauge device, you can install on more. We link the serial number of your TV tuner (sometimes it's the MAC address) with the Activation code. The WinTV application can be installed on as many PCs as needed as long as you use the same Hauppauge device. WinTV v8.5 does not support these products. You must use WinTV v8 if you have a Hauppauge WinTV-HVR-930C (16xxx), the original Colossus, HD PVR model 1212, WinTV-HVR-1100, WinTV-HVR-1300, WinTV-HVR-1400, WinTV-HVR-3000, WinTV-HVR-4000 or WinTV-NOVA-HD-S2. Installation notes for WinTV v8.5: A WinTV v8.5 Activation Code will be needed to install this WinTV v8.5 version.