Now available on Microsoft Downloads.
Application Builder for Windows Embedded Compact 2013 (with the latest fixes as of Sep 2015) provides the tools you need to develop applications that target Windows Embedded Compact 2013. Is an update for Visual Studio 2012/13, not VS 2015
The Sep 2015 (11.0.50801 & 12.0.40625) release resolves the following issues:
Going forward, Microsoft indicated there would be no more new versions of Windows Embedded Compact/CE, just bug fixes/updates and new features. Windows Embedded Compact 2013 is part of the Windows One Windows /IoT diagram; it comes in from the bottom. Microsoft did undertake to develop updated versions of Compact 2013 for use with later versions of Visual Studio. This is not an undertaking to develop new features with these updates. Just to enable development in the VS 2015 environment. A VS 2015 version of Compact 2013 is under development..