Json file missing data

When I am trying to import a Public project, or even my own project from another account I get the following message-
Missing data.type in structure
missing data.project in structure
missing data.ID in structure

What should I do to Import a Public project ?

This might help Import & export a project - Epicollect5 Data Collection User Guide

There is also a video here https://www.youtube.com/watch?v=Z6g_1D2oHmk

Unfortunately, I have tried both the above.
I am using Windows 10. What app should be used to open the JSON file?

JSON is a fairly low level data structure. Normally it’s read by code in packages available for Python or R, like rjson. I’m more familiar with the R world than Python.

What are you trying to do?

It looks like you are importing an invalid file, hence the errors. Can you paste the content of the file you are trying to upload? You can load it here and copy the result on this page.