Is it safe to delete the hidden folder $Windows.~WS and $Windows.~BT?

They are both temporary directories used by windows to update your system.
It is safe to delete both to reclaim valuable space.

To delete them you need to change permissions first:

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

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