I have the same issues
You need to contact the vendor of the extension to get installation instructions. If you have InDesign CC 2015, the way extensions is installed has changed.
You have to turn to Saxoprint. As far as I know, you don't need it to create conform PDFs, I consider this plugin as a kind of computer trash. Export a correct PDF without their plugin and you will not encounter any problems with this trashware.
Don't listen to Saxoprint's advices as:
- You can use RGB images, you should use RGB images, when they want to have CMYK, export PDF/X-1a
- Never outline any font.
This is one of the printer which live 1980s standards and have never set their calendar forward to 2016.
What I was really looking for were some templates for a newsletter. I wanted something new and this was the only free option that came up.
If you have any suggestions for templates I would love the input.
Thanks so much for the help.