For DOCX to PDF conversion, we tried the trial of the product, but table of contents from DOCX was missing in the converted PDF. Please confirm if this is supported in the conversion or not in commercial version.
Aspose.Words does support rendering and building of table of content in DOCX and PDF. You can get the 30 days temporary license and apply it before importing document into Aspose.Words’ DOM.
If you still face problem, please ZIP and attach your input Word document here for testing. We will investigate the issue and provide you more information on it.