@jingmu and @dheerajpoojari: Thank you for bringing this to our attention! Unfortunately, it seems that the original dataset that was used to create this exercise has been removed from Quandl's site. However, I adjusted the Challenge to call a new dataset on outbound tourism from the US. The Start File contains a link to that dataset, and the Solution has been updated as well.
Thanks again, and happy Alteryx-ing!
Great example. Downloading JSON data through public APIs is such an important use case for Alteryx as it opens up a world of data for free! I struggled a bit with the dynamic rename formatting the unicode characters as '___' but used a blog post (https://mixpixviz.blogspot.co.uk/2016/06/controlling-format-of-cross-tab-header.html) to get to the solution.