Issue with downloading an excel file in a training module.

I am working on a module through "Personal Developer Instance." I am creating a To Do App, and when I get to the Exercise to create the To Do Table, I am having an issue downloading the Excel file "todoproject.xlsx. Whenever I click on the link for the file, I get a blank page.  I am new to the Developer Site.  I am not sure whether the file is in a GitHub repository.  Would it be possible for someone to give me an idea where to look for that file?

Thanks!