После обновления sequoia 15.4 все приложения iOS перестали работать.

Third Party Applications that are designed to work on iOS and used on macOS for computer ?

Not ALL iOS applications will work on macOS and especially this specific " My Bible "

From the Apple Apps Store, this application was Last Updated 2 Years ago

Certain misconceptions persist regarding the relationship between Apple Computer and third-party applications

These misconceptions often arise when third-party applications / products fail to function or meet user expectations.

Apple is responsible for addressing issues with its own applications, operating systems.

However, Apple cannot rectify user choices of third-party application / products  installed and used on their computers.

This responsibility lies solely with the third party to evaluate the performance of their products when used on an Apple Computer running the intended version of macOS.

How to contact an app developer

Unfortunately, have seen 1 - 2 others with similar issues as yours

In each case, these Third Party iOS Applications ceased to work after the Sequoia 15.4. or 15.4.1

All too often, outside developers may not have yet Tested their software against the current versions of Sequoia

If that is so

Sorry there really is not too much we can do about this.

We are only fellow Users just like you and me