With licensed version please make sure you call wpdllInt1.EditorStart with your license name/key before doing anything else.
public partial class Form1 : Form
// This loads and fixes the engine DLL in memory.
// It will be used for all the editors created by the application
// and unloaded only
// when the application closes or UnloadDLL was explicitly called.
WPDynamic.WPDLLInt.SetDLLName(Application.StartupPath + @"\WPTextDLL01.DLL");
// Initialize the Editor
// Set your License key:
// Load the PCC file (no password)