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Thanks for using our products.
We used to sell Aspose.Pdf.Kit for .NET under a separate license, but since the release of Aspose.Pdf for .NET 6.0.0, both Aspose.Pdf for .NET and Aspose.Pdf.Kit for .NET are merged into a single product. Please download the latest release version of Aspose.Pdf for .NET 6.3.0 and try using it. In case you encounter any issue or you have any further query, please feel free to contact.
Please visit the following link for information on Concatenate PDF Files