How to delete upgrade files and old system files after Windows 10 official version upgrade?

  

After Windows 10 upgrade, delete the upgrade file and the old system file to release the storage space.

Note: After you delete, you cannot roll back from Windows 10 to the previous system.

1, right click on the C drive, select “properties”

2 Click on "Disk Cleanup",

3, click "Clean up system files", select the file you want to clean, tick in front, click OK,

Note: The old system files are the previous windows installations.

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