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Can I upgrade to Windows 10 from USB?

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Windows Central Question

Upgrade to Windows 10 from USB

Hey Guys,
I used the "Media Creation Tool" for Windows 10 from Microsoft to make a bootable USB Stick from where i can make a clean Windows Installation. But now i read that you have to upgrade first so the system "knows" your key and THEN you can make a clean installation.
My Problem now is that i actually dont want to download all again cause it takes like 7 hours with my connection.
So i wanted to ask if i can UPGRADE my Windows 8 via USB or if i should wait for the download again to install it from my harddrive.
Hope you know what i mean and can give me advice. :^)