I have Windows Home: this error code means that you are trying to activate a different edition of Windows other than Home. For the already installed Windows Home version, the Home key is intended. In such a case, a clean installation of the correct Windows version should be performed. You can find additional information at Microsoft’s official website. 

I have Windows Pro: this error code means that your key is suitable for a different software version than the one installed on the device. For the Windows Pro version, the Pro key is required, the Home version can not be installed. As mentioned previously, a clean installation of the correct Windows version should be performed.

Note: please note that several Windows products can not be used to upgrade your system from another version.