Works for me:
Code:
wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin version=4.9.0 *
Loaded CA certificate '/etc/ssl/certs/ca-certificates.crt'
2020-05-28 21:12:39 URL:https://download.calibre-ebook.com/linux-installer.sh [31887/31887] -> "-" [1]
Using python executable: /usr/bin/python3
Installing to /opt/calibre
Downloading tarball signature securely...
Will download and install calibre-4.9.0-x86_64.txz