The online product description page serves as a landing page for a Windows Store app outside the Windows Store. You can search for an app by using a search engine on the web, and then go to the product description page. From the product description page, you can view the app in Windows Store directly.
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
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.