So, being the dummy I am, I installed Windows 10 Home over Windows 7 Pro. Right now, Windows 10 Home is unactivated because I can't use my 7 Pro key to activate 10's Home edition (I get error code: 0xc004f210 You are running Windows 10 Home. The product key you entered cannot be used to activate this edition.) I found that out through a call with Microsoft -- after we find out I'm trying to use a Pro key on a Home OS, I ask them how I can upgrade my current version of Windows 10 to pro. They tell me to clean install Windows and enter the Windows 7 Pro key at the beginning of the setup (I had initially skipped all of that and waited to activate after Windows 10 was installed)
So, I go to do a clean install off of the USB installer (really old version of Windows 10 that I had laying around from when I initially upgraded my laptop soon after Windows 10 was publicly released). I hit the "enter your product key" right after I select my language (before I select which drive I want it on), and enter my Windows 7 Pro key, but get the "This product key didn't work. Please check it and try again." error.
My first thought is that I should probably download the latest version of the USB installer, and I'm downloading it right now, but that's going to take forever (> 1 day by the looks of it) with my slow internet connection. I'd also have to re-download all of the updates I finally got done downloading for Windows 10.
My question is: Is there some way I can upgrade from Windows 10 Home to Windows 10 Pro, without having to do a clean install, from the Windows store or something without entering the product key until after I upgrade? If I try to enter my 7 Pro key in the store for the "I already purchased 10 Pro let me enter a key", I get the same error:0xc004f210 "You are running Windows 10 Home. The product key you entered cannot be used to activate this edition" I do when I try to activate Home with my 7 Pro key.
Edit: The Windows 10 Home edition I'm running right now is up-to-date using the current version 1511 build 10586.71