If I go to the web site
http://www.multipie.co.uk/calibre-companion/ I see the following:
If I click on the Apple Appstore button I end up in the appstore at
https://itunes.apple.com/us/app/cali...1691?ls=1&mt=8 and see the following:
Do you see something different? You might if your Apple device cannot run CC for some reason.