My initial review of version 1.0 has been removed! This author refused to resolve bugs and after posting the detailed issues they started working on it and released 4 new versions. Shows that I was not dreaming.
The main issues are resolved but there are still open issues so be aware if you buy this. The builder is very limited and you cannot apply custom styling. Documentation is incomplete and the PDF file is generated via a HTTP call. This gave me issues with cookie notices and other pop-ups so I had to write custom code to get it working.
Integration with WooCommerce is using code of 2017 and that generates warnings in your logfiles.