There's an old ActivityLog.xml from 5 days ago with these errors:
<entry>
<record>380</record>
<time>2017/04/14 15:21:32.923</time>
<type>Error</type>
<source>Extension Manager</source>
<description>Extension will not be loaded because an extension with the same ID 'Microsoft.Windows.DevelopmentKit.Desktop' is already loaded at C:\PROGRAM FILES (X86)\COMMON FILES\MICROSOFT\EXTENSIONMANAGER\EXTENSIONS\MICROSOFT\WINDOWS KITS\10\DESKTOP SDK\...</description>
<path>C:\PROGRAM FILES (X86)\COMMON FILES\MICROSOFT\EXTENSIONMANAGER\EXTENSIONS\MICROSOFT\WINDOWS KITS\8.1\DESKTOP SDK\</path>
</entry>
<entry>
<record>381</record>
<time>2017/04/14 15:21:32.923</time>
<type>Error</type>
<source>Extension Manager</source>
<description>Extension will not be loaded because an extension with the same ID 'Microsoft.Windows.DevelopmentKit.WindowsStore' is already loaded at C:\PROGRAM FILES (X86)\COMMON FILES\MICROSOFT\EXTENSIONMANAGER\EXTENSIONS\MICROSOFT\WINDOWS KITS\10\WINDOWS STORE SDK\...</description>
<path>C:\PROGRAM FILES (X86)\COMMON FILES\MICROSOFT\EXTENSIONMANAGER\EXTENSIONS\MICROSOFT\WINDOWS KITS\8.1\WINDOWS STORE SDK\</path>
</entry>