Those unable to see the Challenge after downloading and installing, please follow the above workaround. We are looking to resolve this problem soon:

Load the Editor
Go to Challenges -> Create Challenge
You don't need to add anything here, go to Challenges -> Save Challenge
Then go to challenges folder
Config will be there
Delete the challenge you created.
Load FM -> Challenges -> Your challenge will show.

Many thanks for those raising the problem, and please accept our apologies that you are experiening this issue.