hi, i have the same issue atm..
Looks like there demo content is offline atm . Look for a main.log on your wordpress server to confirm
youll see a heap of these
[2021-03-06 20:15:08] merlin-logger.DEBUG: Remote server returned 404 Not Found for https://demo2wpopal.b-cdn.net/freshio/wp-content/uploads/2021/01/img-possimus.png [] []
[2021-03-06 20:15:08] merlin-logger.ERROR: Failed to import “img-est.png” (Media) [] []
awaiting dev feedback but suggest you await their feedback unlike me who tried 50 different things before realizing it was an upstream issue.
hope this helps
a