You should be able to install it from Google Play, and you don't have to pay again, if you're logged in with an account that you already purchased it with.
The Android TV version has 2 extra screen layouts (portrait rotate right, and portrait rotate left), which you can select by pressing 'Screen Layout' in the radial menu.
You should be able to install it from Google Play, and you don't have to pay again, if you're logged in with an account that you already purchased it with.