Midnight Sun Full Now
It sounds like you might be referring to — either the Twilight novella by Stephenie Meyer, or the full documentary/live concert film Midnight Sun (about the band Aurora).
How to Install?
Before installing make sure to follow these steps given below
Step 1
Backup your data
Make sure you have backed up your device using iCloud or iTunes on your PC or Mac. Otherwise, you may lose your data.
Step 2
Connect your device
You can connect your device using a Lightning or USB-C cable to your PC or Mac.
Step 3
Turn off Find My
On your device, go to Settings - [your name] Find My - Find My iPhone/iPad, then turn off the Find My iPhone/iPad.
Step 4
Install .ipsw file
In iTunes or Finder (Mac), hold down the Shift key (or the Options key on a Mac) and click on Restore iPhone... button.
Step 5
Restore your backup
After iTunes has installed the .ipsw file on your device, follow the on-screen instructions to restore your data.