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#190
The upgrade path is correct. With a valid 7 key at this time you shouldn't even need to upgrade but simply enter the 7 key following the clean install of 10. The guide here mainly was written to address the issues seen with the July 29th 10240 build and those that followed if you signed up that is for the Windows Insider Program since this is how MS was playing it for the free upgrade.
The chances of not seeing 10 activate following an upgrade to 10 type install would be from a 7 installation that lacked SP1 being a requirement. That would be an immediate snag in the fabric there. Then there may have been something else needed since the 10 install may not have been detected as valid for some reason and the upgrade was rejected at the server end.
In fact the best recommendations you will hear before seeing any upgrade install is to first see the previous version installed fresh with all updates go on which I did here and hope not to end up with any buggy upgrade!(Seen that too!) The clean install of course will always be the preferred option for the experienced user as well as what you end up with for the end results. And Bhrayan23 this guide will help a good number of people avoid running into the things many of us saw since the summer months!