The License Key was rejected by the server

Qeustion:

What do I do with a The License Key was rejected by the server error?

Answer:

If the License Key was rejected by the server with the message:

License key does not exist.
You can get your PDFTron demo key by visiting “Request PDFTron Demo Key” page (PDFTron)
or contact sales (Contact Sales | PDFTron) for a commercial license key.

License key disabled.
Your license key is disabled. If you are subscribed to pay as you go plan, please log in to your account (https://pws.pdftron.com/).