Hello,
The trial package includes basic features. Advanced and Premium licenses don't have a trial available.
As the trial package doesn't include DocxUtilities and DOCXCustomizer classes, we recommend you to check the samples available on the documentation pages. Although we guarantee that everything will work as explained on the documentation pages, in you send us the DOCX template you are using we'll generate two sample scripts (using DocxUtilities and DOCXCustomizer) that highlight and replace the placeholders, and we'll send them back with their outputs, so you can chek the output quality.
Regards.