If Office 2013 is already installed or was previously purchased, you can often retrieve your key without needing a new one:
: Sign in to your Microsoft Services & Subscriptions page . If your copy was registered, you can view your product key or download the installer directly from there. microsoft-office-2013-product-key-100-working-final-keys
If you are looking to activate or recover your existing license, 1. Recover Your Existing Key If Office 2013 is already installed or was
For 64-bit Office, use: cscript "C:\Program Files\Microsoft Office\Office15\OSPP.VBS" /dstatus . microsoft-office-2013-product-key-100-working-final-keys