Error 521?

Hi guys…totally new to this, simply looking to install kodi on a firestick. Watched plenty of videos and seems straight forward enough, however when I actually go to the kodi download page – or any kodi.tv page at all on my phone or on my TV, I get an Error 521 which says the website is offline. ..any advice? I use chrome on my Samsung phone and I guess amazon’s own browser on the firestick. I am trying to access the site via es explorer on the TV.
Cheers