Karizma said:
The free upgrade should of activated once I downloaded it right?
Activation occurs during the upgrade, not the download. It should be automatic - in other words the process verifies that your base OS qualifies and then does the upgrade.

I completed the process without entering my Win7 key - it used the Dell OEM key and registered the device on the MS activation servers and placed a token in firmware. License keys are a thing of the past, if you look at System Information (msinfo32), you'll see a partial key that is the base Windows 10 key for that edition. This will be the same on every install of that edition (Home or Pro) and has no real bearing on genuine Windows. Win10 license keys are more like OEM keys of the past - one key is used to install Windows, but the real validation is in firmware.

At least that's the way I understand authentication for Win10.