You have Windows 11 but missing the upgrade software key.
You have Windows 11 but missing the upgrade software key.
If you possess a valid, legal Win 11 Home installation, and you buy a valid, legal Win 11 Pro license, you can apply that license to your Win 11 Home setup, which will upgrade it to the latest version. The terms "valid" and "legal" are essential in this process. Are you currently using Win 11 Home? Have you considered updating your firmware so your HP Z440 PC becomes compatible with Windows 11? Also, is there a need to change the TPM version if you plan to apply the firmware update for compatibility? You can find more details on forums.
I need to check if the cheap license I bought for Windows 11 Pro can be used after upgrading from 11 Home to 11 Pro.
Tried activation several times, and it reports ACTIVATED SUCCESS.