In case it is useful this tutorial has multiple methods for manual deletion:
https://www.tenforums.com/tutorials/2066-how-delete-windows-old-windows-bt-folders-windows-10-a.html
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Use the Microsoft ADK tool to deploy the Win10 operating system. After the restoration, there will be a Windows.old folder and a Factory folder under the C drive. How can the system automatically delete these two folders after the system restoration?
In case it is useful this tutorial has multiple methods for manual deletion:
https://www.tenforums.com/tutorials/2066-how-delete-windows-old-windows-bt-folders-windows-10-a.html
Hello,
Windows.old should be deleted about ten days after installation automatically.
Here is the Link on the Microsoft site to remove it.
Delete your previous version of Windows