How to reclaim space after upgrading to Windows 10 April 2018 Update

Did the available space shrink on your hard drive after installing the Windows 10 April 2018 Update? Here's how to get the storage back.
As part of the April 2018 Update (version 1803) install process, Windows 10 saves a copy of the previous installation files in case the system needs to revert to its original settings due to an error during the upgrade, or you need to rollback because of a problem after the upgrade.

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