Why i can't install "Excel add in " extension?

[ekaramansivasankari (Sivasankari E)]

When i was trying to install Excel add in extension … its showing like the attached image. and when i was trying to access the link that had shown it go me to the 404 error page…
[

](https://error page image)

[Yoichi]

Hi,

The following document may help you.

Studio - Excel Add-in

Regards,