(CORS) will prevent the project from running locally on the computer. (I haven't figured out how to solve this yet).
To get around this, you need to copy the content from the json file to index.html as a javascript array. I described this problem in more detail here:
https://kirilllive.github.io/Tuesday/tuesday_doc.html#cross_domain_error
try running example_tour_guide.zip downloaded from this page (https://kirill-live.itch.io/tuesday), it is exactly the same but can be run locally.
Or start the "insurance_agent" from same repository.