Windows 10 wasted space

I have a windows 10 system with the $windows.~bt file still occupying space.

It is supposed to be the queued upgrade from 8 to 10, and hopefully can be deleted.

A page with info on it is here

http://www.thewindowsclub.com/delete-windows-bt-ws-folders-windows-10

There is an interesting bit about forcing deletion of files like this which is worth recording

Copy-paste the following and hit Enter to delete the contents of $Windows.~BT directory

takeown /F C:\$Windows.~BT\* /R /A 
icacls C:\$Windows.~BT\*.* /T /grant administrators:F 
rmdir /S /Q C:\$Windows.~BT\

Now copy-paste the following and hit Enter to delete the contents of $Windows.~WS directory

takeown /F C:\$Windows.~WS\* /R /A 
icacls C:\$Windows.~WS\*.* /T /grant administrators:F 
rmdir /S /Q C:\$Windows.~WS\