Hello,
Thanks for your response.
Please note that converting HTML to PDF is a functionality of Spire.PDF and not part of Spire.XLS. Even though you have a license for Spire.XLS, If you want to convert HTML to PDF, you will need a separate license for Spire.PDF. Without a license for Spire.PDF, you will only be able to convert 10 pages of HTML to PDF. Additionally, the version of Spire.PDF referenced by your Spire.XLS is higher than the maximum version you can use, which means your license for Spire.PDF(Expired on February 26, 2020) will not be effective in your project either. If you want to use Spire.XLS Spire.PDF, and Spire.Doc in the same project, we still recommend contacting our sales team ([email protected]) for renewal and installing Spire.Office via the NuGet manager in your project.
Sincerely
Wenly
E-iceblue support team