Let's try some troubleshooting steps to see if we can resolve the issue. First, I recommend rebooting the device by shutting it down entirely, then turning it back on and trying Pandora again.
Something to consider, the current version of Pandora for iOS requires iOS 13. To confirm the iOS version you are running on your device, open your device's Settings, go to General, About, and Version. If you are running a version older than iOS 13, you will need to update your device's operating system (OS). Please refer to this article on how to do that.
Otherwise, I'm afraid you won't be able to download the current version of the Pandora app on that device. Previous versions of the Pandora app are not available for download.
If you're still having issues, try uninstalling and reinstalling the app (not to worry, we'll keep track of your profile and collection for you).* To do that:
Hold down the Pandora icon on your Home screen until all the icons start "shaking."
Then tap the tiny "x" that appears in the upper left of the Pandora icon, and confirm that you want to delete the app.
Then re-install Pandora via the App Store on your device.
*Please note: Pandora Premium and Premium Family listeners may need to re-download some of their offline content after reinstalling the app. Pandora Plus users, however, should receive that offline content again automatically. If you have any trouble with your offline stations after reinstalling, please let us know.