itch.io

RPG plus is mostly designed to create your own campaign. 

Anyway on our website we shared the adventure Crown Mountains,  the story we are using for the beta testing of RPG Plus. It is designed for a fantasy setting like Pathfinder or D&D, and at the following link

https://www.appmindedapps.com/crown.html

you can find the pdf with the story and files including all the maps and sheets for playing.

Thanks for your post, actually it may be a good idea to include more pre-made materials easy to use and customize.