In order to be able to download and start using the Viaplay application on your Apple devices you need to have an Apple ID that is set to one of the countries where Viaplay is available; Iceland, Denmark, Norway, Sweden or Finland.
If your Apple ID’s region is set to any other country than the ones mentioned above, you need to change it to be able to download Viaplay on your device. Go into your device settings, click on your name in the top of the screen and iTunes & App Store > Apple ID: xxxxx > View Apple ID > Country/Region. Choose your new region and confirm. You should now be able to find Viaplay in the App Store.