The epic game launcher prevent the Mojave system to update

HI .
I am a newbie to the this engine and do not want to offend it .
But recently I have met some serious problems between the launcher/UE4 and the Mojave system .

I have downloaded the launcher in Mac ,and I remembered when I installed it and it want to change the registry of the computer . I agreed . Its Mojave 10.14.

And now I need to update to Mojave 10.14.3. Its never succeed.

The AppleCare check the problem and came with the result that some important thing in the registry has been changed .

The registry change only happened in the launcher and UE4.

So can anyone help me ?

I have tried to move the launcher to trash , but cannot solve the problem .

And its still new to me , I cannot get the way it works . It seems that its not an app, for I just find the launcher in the application ,but cannot find the UE4. So when I move the launcher to trash ,I am not sure the whole thing has been into trash.

And I still want to search and learn the Unreal engine , I can’t clean the trash and the launcher , for its a long time to download the UE4.

so, help!