I bought this software and now it wont let me use my key

[Arafaxx]

so basically I bought this software when it was in the version 10.xx (cant remember it) and now its in 11.45. I recently got a new pc and forgot about this software and only just realised I have it so I downloaded it and tried to register my key and it said this key was for a older version even though I thought it would work forever. Is there a way to downgrade to a older version or can someone make my key work file:///C:/Users/44776/Downloads/why man.png

[Vacublaster]

I have the same issue, I upgraded my software and now the key no longer works citing it is for an older version. I am more than happy to go back to the older version but where to get it from?

HELP Please

 

[Marie_NCH]

For help with restoring the version that matches your license, please contact the support team. An agent will be glad to provide you with the link to reinstall your program correctly.

Here's the link: https://www.nch.com.au/support/index.html