How to run a separate code in exec in a pyqt5 program?

Question

Python

there is a program written using pyqt5, it has an entry button, when pressed, a completely different program should be opened that is sucked from the server, I decided to put it in exec, but in the program that is sucked from the server, threads and other classes other than the main one do not work.

and even after pressing the button in the console it is displayed

WARNING: QApplication was not created in the main() thread.
WARNING: QApplication was not created in the main() thread.