First off, you should check the settings of your Internet connection. It might be required that you make some proxy adjustments, in order to properly use Hquotes. Also, don't forget to configure your firewall in order to allow Hquotes to access the Internet.
I installed the application, and indeed, when attempting to download End-Of-Day symbols, it failed. I think this has to do with the source of the information. The application acquires the necessary data from Yahoo Finance servers, and recently, they made some changes (certain links from Yahoo are not available anymore). Also, the website of Hquote's developer is not currently active. It is possible that they are working to remedy the situation.