More Info:
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Softpedia: More Issues Said to Be Caused by Windows 10 Cumulative Update KB4013429
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Softpedia: Easy Fix for Windows 10 Cumulative Update KB4013429 Issues
Good News:
Emergency Update by Microsoft to fix issues caused by the earlier KB4013429 update:
… which links to:
http://www.catalog.update.microsoft.com/Search.aspx?q=KB4016635
EDIT add: