In addition to a new Cumulative Update, Windows 10 1803 is also receiving a servicing stack update.
The servicing stack includes the files and resources that are required to service a Windows image. This includes the Package Manager executable, the required servicing libraries, and other resources. The servicing stack is included in all Windows installations.
More information: Servicing stack update for Windows 10, version 1803: June 26, 2018
Download the standalone package: http://www.catalog.update.microsoft.com/search.aspx?q=kb4338853
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