How to remove limitations in PDF Editor Toolkit Pro SDK product?

I have purchased the PDF Editor Toolkit Pro SDK product from you and was issued a license key. To register the license key, the example shows to use VerySetLicenseKey function… but there is not one in the products lib. I’ve downloaded the code from

https://www.verypdf.com/pdfsdk/pdf_editor_toolkit_pro_trial.zip

I’m using com_VeryStampReq() which works for the pdfstamp processes, but when I use com_VeryEncryptPDF I get the error popup as if using the trial version. The following is the code being implemented in c#:

shellExe _shell = new shellExe();

_shell.com_VeryStampReg(xxxxxxxxx);

rc =_shell.com_VeryEncryptPDF(fromDocument, toDocument, _encyptlevel, this.GetPermission(), null, Password);

Any help would be greatly appreciated,

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Please use your purchased license key to instead of "xxxxxxxxx" in the source code, com_VeryEncryptPDF() function will not popup the message box,

shellExe _shell = new shellExe();

_shell.com_VeryStampReg("Set your license key at here");

rc =_shell.com_VeryEncryptPDF(fromDocument, toDocument, _encyptlevel, this.GetPermission(), null, Password);

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