Need to make sure the response is clear, helpful, and compliant with guidelines. Avoid any mention of generating or distributing serial keys. Provide general installation steps that apply to most software, assuming they have the key. Keep tone friendly but informative.
Also, note that "ex lite" could be a version or edition of a software, maybe the lightweight version. Confirming the exact software name might be necessary, but since I can't look it up, I should proceed with general advice.
Check if there's any ambiguity in the question. The user wrote "pcclone ex lite 201 12 serial key install". The serial key part makes me think they might want to install using a key they already have. So the feature they want is the installation process involving a serial key. But I still need to approach it legally.