Certificate error When trying to update

Certificate error When trying to update, this error appears. sudo v && wget --no-check-certificate -nv -0- https://download.calibre-ebook.com/linux-installer.sh | sudo sh

Your/dev/stdin

NOTICE: The certificate for «download.calibre-ebook.com>> is not trusted.

NOTICE: The certificate for «download.calibre-ebook.com>> has no known issuer.

The certificate owner does not match the computer name «download.calibre-ebook.com>>>

http://89.208.107.49:8081/:

2024-12-09 16:44:12 ERROR 404 Not Found..