Hey, thanks for trying out my addon :)
I have no Idea why this might happen... If you want, you can create an issue with more details (blender version, operating system, etc...) on the projects github page (https://github.com/AntonFlorey/PolyZamboni/issues) so I can have a look at it.
Hello I tried to use this add-on but the pdf is corrupted and the svg doesn’t download, do you have any idea why this might be happening?