Hi Jim
When you purchase a Microsoft Office licence, you should be provided a Product Code
You then go to Office.com, sign in with your Microsoft Account details, enter the code and office will begin downloading and installing
From then on , your Office account is managed online, by simply logging into office.com, you can transfer your Office licence to another PC . . etc. from there
If the above process is not what you were provided by Microkeys and they had you log in under their login details, then you have been had and you should demand your payment back . . .