For once the “Getting started” documentation was clear and correct.
I plugged the Chromecast #1 (upstairs) into my TV via HDMI; then I had to go online on my smartphone to do the “Setup”, this involved downloading and installing “Google Home” this was so beautifully easy. Before the Chromecast could be used it needed to update its software. I was prompted to link it to my router; and after that, it didn’t take long before it was up and running.
While I was at it I also installed “Google Home” on my live smartphone (Samsung S4) and on my tablet (Samsung Tab 4), great, the Chromecast can now be controlled by any of the 3 gadgets.
I then wanted to install another Chromecast #2 downstairs. It hooked up ok, but the update just looped – it stayed on 0% for hours on end until I “x’ed” the upgrade. Thinking about it decided that maybe the “Google Home” apps needed to be re-installed, so I uninstalled “Google Home”, cleared the cache and data in “Play Store” – but alas – my Wi-Fi network is now refusing to let me install anything from “Google Play Store”. It was a faulty “Chromecast” and it has been returned and refunded.
It was not my applications/gadgets that were faulty; because when I went to my neighbour and use their Wi-Fi to download from “Play Store” it worked fine. It took about 3 weeks before my Wi-Fi was working correctly again.