I had the same issue, bought the plug in, went back to use and wouldnt let me use..seems was an issue with ILOK registration and Neural DSP not linking plus being on Reaper for some reason..took a few messages till got result..keep messaging them was my only way to get a result..Good luck
Sorry, I should have followed up here. This was an iLok issue, and entirely my doing.
As I was putting the information together, I was reminded that I had a second iLok account and it was registered to that one rather than the one I used for most stuff. So I fixed it before actually needing them to intervene.