NVPlayPro is the upgrade version of NVPlay, just for digital night vision E50-II Plus/E53/D31 player, for customer experience use. NVPlay for E50-I and E50-II. NVPlayPro for E50-II Plus/E53/D31. Please visit http://www.wanney.com/download to download the associated files of the devices first. Any question and suggestions, please visit http://www.wanney.com/Contact-Us feed back to us, or email to [email protected]! Thank you!