How can I get Cortana working on my Nokia Lumia 1320?

[Windows Central Question]

Nokia lumia 1320 cortana not work

I already select region - u.s. Keyboard, and language - english (united states) select . Phone restart but cortana will be not work . And keyboard english (united states) language show attention download required and i tap this option and show download after some time show error downing . Can me solution this problem