I'm using Window Vista and Explore 9 and I tried "Do not save encrypted pages to disk" and beside it was already uncheck. Do anyone know why I'm getting the error "This file couldn't be downloaded" and how can I fix it.
The security software or firewall might be blocking the download. Try disabling the antivirus and firewall temporarily to check if they are causing the issue.
Trying another browser would also be a good idea. You may also try resetting the Internet Explorer. Check the link below for steps:
Hope this helps.