Cant access ES Downloader on Firestick

Hi

I am trying to intall Kodi on my Firestick that I purchased in November last year. I have tried 4 Youtube videos and have tried to intall version 16.1 with no luck then tried version 17 with no luck either.

Everytime I get stuck at the point were I try to launch the ES downloader when I am on the Kodi website but all I ever seem to get is an option to view what looks to be computer code. I live in the UK and suspect that my ISP (BT)could be attempting to block me downloading Kodi.

I have found a fix on the internet to alter settings on my router but before I do this does anyone know any other reason?

Many many thanks for any help provided as this has become a real pain.