can't install older version in linuxmint 18.1

i read the instructions that said:

Reverting to a previous version
You can install a previous calibre release, like this:
sudo -v && sudo apt-get remove calibre && wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin version=3.29.0

Change 3.48.0 above to whatever version you want installed.

well, it removed the current version of Calibre ok, but then it went on to say:

Error: https://code.calibre-ebook.com/signa..._64.txz.sha512 returned an unsupported http response code: 404 (Not Found

so this last part in invalid. how do i install version 3.29 ?