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Quick PDF Library Lite does not appear to contain the CreateLibrary() function needed to create an InstanceID as show below in your example code for C#:

int InstanceID;
InstanceID = QuickPDFCreateLibrary();
if (QuickPDFUnlockKey(InstanceID, "your license key") == 1) {
QuickPDFDrawText(InstanceID, 100, 500, "Hello world");
QuickPDFSaveToFile(InstanceID, "C:\Docs\HelloFromDLL.pdf");
}
QuickPDFReleaseLibrary(InstanceID);

How can any of the functions in the Lite version of your PDF library be used without the CreateLibrary() function?

Quick PDF Library Lite is an ActiveX and so does not require an Instance ID. The Instance ID is only required by the DLL edition of the commercial version of Quick PDF Library.

In addition, you do not need to -- indeed, you cannot -- call the UnlockKey function when using Quick PDF Library Lite because it is a free product and there is no license key required.