If your on a previous version of Go 4 and have not updated it, even though IOS has probably been telling you a new version of Go 4 was available and you were merely not installing it.
The App Store says its 4.3.42. is the only one there is now.. Go 4 and has not been updated for several months or more. And since all new DJI Drones are now using "DJI Fly", not Go 4, there will probably not be many more updates forthcoming, unless there is a complete incompatibility with some future version of the applicable OS and DJI puts out something to fix that..