When you start and then pause a download in Internet Explorer 11 Preview on a Windows 8.1 Preview-based computer, the download cannot be resumed.
To resolve this issue, install update 2864808 from Windows Update.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates