Yes, you can use the application in Windows 7, because Windows 7 is a supported version. In fact, here are the supported versions of Windows where Nano Studio can be installed: Windows XP, Vista, 7, 8, and 10.
Use the following website to obtain the product: http://www.blipinteractive.co.uk/download.php
There is also a manual to see how the program operates and how it can be configured with your MIDI controller.