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Okay, so We are not Microsoft.....just to clarify that.
However, I can help you get your Microsoft Office 365 working again on your New computer.
What we will have to do.....is called a Remote Session.
okay.....best of luck.
to download the actual office product you need to go to this page
once there you will have to sign in to your microsoft account
that may be where you are having a problem.
If you have not completed the process of buying the ms office you can just make a new ms account.