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

  
After the Windows 10 upgrade, delete the upgrade file and the old system file to free up storage space.
Note: After the deletion, you can't roll back from Windows 10 to the previous system.
1, right click on the C drive, select “Properties"

2, click “Disk Cleanup&; Br>
3, click "Clean up system files" in the selection of the file you want to clean up, tick in front, at the point to determine,
Note: the old version of the system file is the previous windows installation.


Copyright © Windows knowledge All Rights Reserved