My phone will not let me download an app it says I have to be updated to a iOS 13.0
iPhone 6, iOS 12
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Then you will need to update the phone.
The developer has updated the app for that iOS version and any version of iOS lower than 13 cannot use it.
M1 Mac mini, macOS 12.5; Watch, series 5 GPS/cellular, watchOS 8.7; iPad Pro 2nd Gen, iPadOS 15.6; iPhone 12 Pro, iOS 15.6; TV 4th Gen, tvOS 15.6; HomePods, audioOS 15.5.1 and Airport Express w/ Airplay 2