Oh...Windows Media Creation tool is the best option for upgrading to Windows 10,unless you're willing to install a clean version of Windows 10,it's not a bad idea, but you need to do more.So about using Media Creation tool:
https://www.uubyte.com/windows-media-creation-tool-guide.html
Or...
I don't think upgrade from Win 7 32-bit to Win 10 64-bit is a right,even if i have not done it,to avoid trouble, it's best to do a clean install of Win 10 64 bit.