Beware cheap license keys
I purchased the license key to upgrade a win 10 home laptop to win 10 pro. I tried doing this but it failed, saying I couldn’t do it. It seems that this was because the laptop had previously had a free upgrade from win 7 home and retained the original license key. You cannot upgrade win 7 home to win 10 pro. I then tried to upgrade a pre-installed win 10 home laptop to win 10 pro. It failed saying the key was invalid. It appears you can upgrade using a “generic” key, following which you need another key to activate the upgraded OS. I did the upgrade successfully. I also got a new key from the same source but when I tried to use it to activate the upgrade, it failed, again invalid.
If intending to purchase one of these cheap license keys you need to check that it will upgrade your current OS and you need to be aware that the key you receive might not be valid anyway. You also should be aware that if you have an old PC knocking about that you don’t use anymore or have the license key, you might not need to purchase a key at all.
Verified purchase: YesCondition: New