These are a few reason why users cannot remove watermark correctly from Generator SDK or Merger SDK (assuming the customer follows the licensing documentation correctly).
1. Missing license:
Generator SDK and Merger SDK are in the same library. If the customer has a license for Generator and uses Merger functions then it will display the watermark. If the customer has Merger license, however, did not get a Generator license and uses Generator functionality it will display the watermark.

2. Bad Computer Name:
Please confirm that the full Computer name that was provided to the support matches the computer that the SDK is being used on.