Actually, the last version of Now TV that works on Firestick is apparently 10.4.1 though it brings it's own set if issues and on further reading, it may not work.
I don't use nowtv myself so haven't tried this but there might be a fix for this, might not.
Thanks for taking the trouble to help.
i tried solution one but it did not work. I will try option 2
thanks again for your reply
You can't do this as you still need to download the now TV player which the firestick doesn't support.