What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Our apologies for the problem! I've checked the form and I was able to download and open the excel file without any issues. It must be a temporary problem so kindly try it again and update us here for the result. We will forward the thread to our developers if the same thing will happen.
Please don't forget to clear your forms cache first: http://www.jotform.com/help/229-How-to-Clear-your-Form-Cache.
I look forward to your reply.