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Hi melusina_M-
I'm Kevin B. Independent advisor and a Windows user like you. I do apologize for the inconvenience on your storage and Windows update, let me help you sort things out.
Actually Windows 10 2004 is the new version of Windows 10.
It contains large amount of size because it has the new build and new features of Windows.
If your have a low storage capacity, kindly run a disk clean up on your system to free some space.
Kindly refer on this link on how to run disk clean up:
https://support.microsoft.com/en-ph/help/402661....
Hope that will help and have a bless day!
Thanks.
Kevin B.
Independent advisor