Windows 10: Windows 11 Key/Upgrade

Yesterday i got a usb with windows on it, and i installed, the only problem is i do not have a product key to activate windows fully. I was looking at best buy to see which one i can purchase, because i have discount codes for the website that i can use when buying the windows 11 product. I saw one that is digital. It was "Upgrade to Windows 11 Pro from Windows Home." Since i already have windows 11 pro installed but not activated, can i buy it and it will activate the windows, or do i have to buy the windows 11 pro product buy itself to get the product key/license for it? I did build my PC so

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Upgrading to windows 11

I have a few questions about windows 11...

1. How many GB it is? when my pc suggested the upgrade yesterday, it said it's about 4GB just want to be sure.
   
2. I'm using a windows 10 pro so if I upgrade, will it upgrade to a windows 11 pro?
   

 

Windows 11 Home to Pro upgrade

Want to upgrade 11 Home to 11 Pro. Tried download, but apparently files transferred were for 11 Enterprise. This will not activate; error is "invalid digital license or product key". This is on a new Surface. How to proceed?

Can withdraw/delete this. The suggestion to downgrade - listed below - with a 'fake' windows 10 key works.

 

Upgrade to Windows 11

I want to upgrade my OS from Windows 10 to Windows 11. I have run the compatibility software and got the message that says my Windows 10 software is not compatible with upgrading to Windows 11. I'm looking for a point & click application that will make my Windows 10 OS upgradable to Windows 11 or a file that will provide step-by-step instructions on how to accomplish the upgrade to Windows 11. I expect a list of files/applications that will not run in Windows 11 because my PC is not capable of running the new applications w/o hardware upgrades.