Sudden Exception in Convert with trial demo key - When already worked before

[Ryan]

Your provided sample code neither calls PDFNet.Initialize() nor PDFNet.Terminate(), so it is unclear how it relates to the issue at hand.

PDFNet.Initialize() must be the first PDFNet API call you make. If it was working before, but then stopped working, without any change in your code, then there must be a race-condition.

PDFNet.Initialize() should be called once for your process, as early as possible.

PDFTron PDFNet must be initialized with a valid key exception

If you get an exception with a message like the following This product must be initialized with a valid key when you call PDFNet.Initialize(); with no argument, then you need to apply either a demo key, or your purchased license key. I am evaluating PDFTron You should have already received a demo licence key. Please see the getting started documentation that comes with the SDK you are evaluating. If you are still stuck, please go to support.pdftron.com for further assistance. The correc…

If none of the above helps resolve the issue, please modify one of our SDK samples to reproduce.