1.Uninstall the trial version PDF417 .NET control if applicable.
2.Complete the installation for the full version PDF417 .NET control, copy MW6.PDF417.dll in VB.NET or C# demo project sub folder of the destination folder (e.g. "C:\Program Files\MW6 .NET Components\PDF417") to your project folder to replace the trial version PDF417 .NET control .dll file.