DavkaWriter 6 has a built-in PDF export.
To use this export function, open your DavkaWriter document. Click File -> Export and set PDF as your file type. Name the file, note the location where the file will be saved (the folder name listed at the top of that window) and click Export. Your file will be exported to PDF.
If you are using DavkaWriter 6.0.5, 6.2, 6.4, 6.5, or 6.6.1 and PDF export is not working for you, install this update, which will update your PDF creator and restore your PDF export functionality: