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#11
Most of the cheap product keys you see for sale that require you to download Windows are System Builder's OEM licenses. Also, any Windows 10 that comes packaged with a DVD is System Builder's OEM.
You do not need a MS account. Just do not connect to the internet during the Windows install process until after you are completely logged in to a local user account.
And, yes, you can uninstall the MS Office that comes with Windows 10.