Noiseware has rather detailed instructions for Installation.
If you are doing a fresh installation, you will need the License Key which Noiseware e-mailed to you when you purchased the software.
(This is different from the Product ID SN which shows in the installed Plug-in.)
Hopefully, you did keep that eMail?
I have just done a fresh installation of Noiseware 5.0.3 in Ps CC 2015 and it works perfectly.
If you have lost that e-Mail, and have mo record of the Licence Key, then you could try to contact Imagenomic and see if they can help you.