E-mail with a PDF invoice link is not working in Internet Explorer

Hi,
I received an email with a PDF invoice link, but it is not working in Internet Explorer.
I tried in different browsers and it works fine.
Please see the screenshot:

Unable to download/from templead.org. Unable to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later.
Do you know why this could be happening?
