[PDFNet] Could not load file or assembly 'PDFNet.dll' ' when using PDFNet for .NET 4.x

Technical Support Apryse SDK
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The PDFNet x64 library is for targeting frameworks 2.0 - 3.5. Since your building .net 4 or 4.5, you should use PDFNet for .Net 4.

https://www.pdftron.com/downloads/PDFNetDotNet4.zip

You can see the libraries and the frameworks they target at this link
https://www.pdftron.com/pdfnet/downloads.html

If there is some reason to use the .Net 2 assembly, the following article might help.
https://stackoverflow.com/questions/3179028/mixed-mode-assembly-in-net-4