The Chromecast app no longer works on my laptop, but does on a smart phone. It looks like the only way you can cast the Chrome app to the TV is via a smart phone or a ChromeBook. It works fine on my old Chromebook I kept as a backup, so I finally have a use for it. Much easier to use than the phone. At least for me.
Casting was integrated into the Chrome browser nearly three years ago. You either are in serious need of an update to your browser -- current version is 73 -- or you simply never noticed the functionality was available within the browser. Update your browser, then remove the extension/plugin for casting. At a minimum, disable it.