I just purchased an Esri demographic report (05/27/2019). Is it the case that I am getting a 404 error because they won't let me download it today? If so, they should have posted a warning to that effect on their website.
This issue was resolved on Friday 3/31. Please let us know if you are still having trouble.
Sorry that you were seeing an error trying to get that report. Did you reach out to firstname.lastname@example.org ?
I like Kory's suggestion. Also, posting this on the related products community in GeoNet may help you get a response. The report you are referring to isn't accessed from My Esri.
Retrieving data ...