there must be something blocking the download of the software.
First: Verify that your security settings in your browser isn't too high (see attached file :options/security) or allow the url to be included in the allowed sites.
and verify that your Proxy settings are well configurated in the Proxy configuration screen of the simulation
Fourth: Verify your that your antivirus does not block our simulations to use the Internet connection. Fifth: If it's still doesn't work, contact your IT or your internet provider