Windows 10: Which win11 pro upgrade is legitimate?

I see plenty of sites selling win11 pro upgrade for cheap, like $25 e.g. stacksocial. But I think they are OEM licenses.bestbuy sell them for $100 each.How can you tell which one is legitimate? What is the cheapest, legitimate one selling for? And why don't Microsoft shut down the illegitimate ones?

:)

 

Win11 upgrade not coming

If you checked again my previous replies, you can see ASUS re-installed my new notebook a even newer Win10 Home installation. After this 2nd time installation, I only did these to the toy:

1. installed chrome
   
2. changed its display brightness
   
3. changed wallpaper
   

After your previous suggestion, the 1 month temp McAfee was gone.

I can't figure out why I can't upgrade to Win11 for such a new notebook. Newer notebook will come with Win11 natively

 

Is the win11 home key keept after upgrade to win11 pro?

I have a win11 home activated with a digital license connected to my ms account. Will the license still be available after upgrade to win11 pro?

 

Upgrade Win11 Home to Pro with Win10 Pro license

I purchased a PC with Win11 Home on it.

I have on my Microsoft account a Win10 Pro license from my old PC that is not being used.

Can I use that Win10 Pro license to upgrade my new Win11 Home to Pro?