Install from the browser
CyberFlix installs from the browser in two taps. On Android phones and tablets, open this address in Chrome and choose Install app. On iPhone and iPad, open it in Safari, tap Share and choose Add to Home Screen, which answers "cyberflix for iphone" directly. The icon opens full-screen with your list inside.
Latest version, always
The installed app updates itself every time the site does, so the "latest version" and "old version" questions of the APK era answer themselves: the version on your screen is the current one.
On televisions
On a Firestick or Android TV box, open the address in the device's browser; the Firestick guide has the steps.