This tool may help.
https://www.nirsoft.net/utils/product_cd_key_viewer.html
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I have windows 10. I am unable to activate office 2013 as I don't have product key
This tool may help.
https://www.nirsoft.net/utils/product_cd_key_viewer.html
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
Hi @sonal ruprela ,
If you damaged your product key, but have a valid proof of purchase, Microsoft support may be able to replace your product key or provide other options. Contact Microsoft support for assistance.
If you're shopping for Office elsewhere, we recommend that you review our tips for safer shopping to make sure you're buying genuine Microsoft software. Be sure to read the tip called Beware of Product Keys Sold Separately if you want to buy a product key online.
Just checking in to see if the information was helpful. Please let us know if you would like further assistance.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.
If you have bought Office 2013 and ever activated it, the key will be binded to the Live ID you used to sign-in Office, and you will no longer have to worry losing it again.