Application requires IOS 12.4 or later

Which model of iPhone?

Update your iPhone to iOS 12 or newer, and try again.

Here is how to: Update your iPhone, iPad, or iPod touch - Apple Support

If your iPhone cannot be updated to at least iOS 12 or to iOS 15 (iOS 15.6.1 is current), your choices here for this app are to convince the app vendor to add support for older iOS versions, or to replace this iPhone with a newer (used, refurb) or new iPhone.

Check compatibility:

Go to Settings/General/About and note the Model Name

• NOTE: iOS 16 is not available for any models except to iOS developers and beta participants. General release will be in Fall, 2022
• iPhone 12 or 13 series: You can update to 15.6.1
• Any model 6S or newer (including original SE, 2nd and 3rd editions): You can update to 15.6.1
• iPhone 5S or 6: You cannot update to iOS 13 or higher; you can update only to iOS 12.5.5
• iPhone 5: You can update only to 10.3.4
• iPhone 5C: You can update only to 10.3.3
• iPhone 4S: You can update only to 9.3.6
• iPhone 4: You can update only to 7.1.2