Consider the following scenario:
You use Internet Explorer 11 or Internet Explorer 10 to download a file from a specific URL.
The file is a type that cannot be rendered natively by Internet Explorer, such as a PDF file.
The server response does not provide any HTTP cache control directives.
In this scenario, Internet Explorer 11 and Internet Explorer 10 may reload the cached version of the file even if a newer version is available.
To resolve this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update. Additionally, see the technical information about the most recent cumulative security update for Internet Explorer.
Note This update was first included in the August 2015 security update for Internet Explorer (MS15-079).
To work around this issue, use one of the following methods.
Method 1: Delete the Internet Explorer Browsing History
To delete all or some of your browsing history, see View and delete your browsing history.
Method 2: Download the file from a new instance of Internet Explorer
Close Internet Explorer, and then make sure that all instances of the process are closed. Then, start a new instance of Internet Explorer to download the file.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
See the terminology that Microsoft uses to describe software updates.