Ol Pal,
You can download the install media for Win10 (Home or Pro).
You can perform an "upgrade" install... making sure not to save or migrate anything.
This is essentially the same as a clean install of Win10.
Once finished, you can use Disk Cleanup to remove all remnants of Win7.
You can do this at any time (no need to update Win7 further).
Of course, you can also just do a clean install of Win10.
I'm available if you need assistance.