If Vida was a variant of Android, as the label above implies, then Now should be downloadable from the App Store.
Failing that, punt £30 on a Roku Express HD, or £38 on the 4K one*, and get pretty much all the apps you could wish for.
Saves waiting and hoping Now will deign to put their App on the TV itself.
A Firestick would work also, but the UI is pants.
* Now won’t take advantage of 4K - HD will suffice - but other apps will.