Because Office 2013 no longer receives security updates, it is highly recommended to switch to a supported version:

If you already own a license, you should try activating it through your Microsoft Account.

: Enterprise communication and form creation tools. Current Activation Options

: If you see "Unlicensed Product" errors, verify you are signed in with the correct account or check for conflicting Office copies on your device. Recommended Alternatives

: Consider LibreOffice or Google Docs for compatible, no-cost document editing.