Hello XRCVC,
Welcome to Microsoft Community.
I am a Microsoft user just like you, I hope you are doing well?
Sorry for the inconvenience, I will recommend you reach out to Microsoft support via live chat to assist you with this activating Office.
They will be able to unlink your previous installation.
Kindly go to Microsoft Contact Us website:
http://support.office.com/home/chat
- Type the issue and click Get Help.
- Click Login and Contact Support at the bottom of the page.
- Log in with your Microsoft account.
- Make appropriate selections
- Click "Chat with a support agent".
Please let me know if you need more assistance.
Give back to the Community, Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below.
Warm Regards