Get back lost storage after applying the October 2020 Update for Windows 10

[Windows Central]

Are you running out of space after the Windows 10 October 2020 Update? Here's how to recover most of the space.
On Windows 10, when you upgrade to a new version, such as the October 2020 Update, the setup process creates a copy of the previous installation in case the device has to roll back to its original settings because of a critical error or compatibility issue during or after the upgrade.

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