The browser is the path today
No download, no account. Open the link in a supported browser and you're in.

A current desktop or mobile browser is all you need.
No download, no account. Open the link in a supported browser and you're in.
Video calling relies on recent browser features. If something behaves oddly, updating the browser is the first thing to try.
Desktop and mobile builds are being worked on and aren't a public download yet. Use the browser in the meantime.
There's no Smart TV store app. Start on a phone or PC and mirror or cast to the big screen instead.
See also What you need and Get it on a big screen.