Installing Windows without a license is not illegal, activating it through other means without an officially purchased product key is illegal.
Is it legal to activate Windows 10 using cmd?
Installing Windows without a license is not illegal, activating it through other means without an officially purchased product key is illegal.
Is it safe to activate MS Office using cmd?
It is definitely not legal and you should purchase an Office licence if you wish to use that software, and once Windows updates finds that has been done, it will disable your Microsoft Office . . .