1) First, you need to expand the Menu at the top. To do so, click this icon in the top right corner of the launcher.

2) After you have done that, click on the "Settings" button.

3) You should now be on this screen.

4) Now, turn on the two options "Keep the launcher open while the game is running" and "Open output log when the game starts" by clicking on the grey buttons.

5) The buttons should now be green. Start the game now by clicking on "PLAY".

6) This windows should appear now. Just let it run in the background.

7) As soon as your issue has occured, click on the drop-down menu in the top left corner.

8) Choose "All" in that drop-down menu so your whole log shows in the window.

9) Now, you need to press the "Ctrl" key and the "A" key on your keyboard at the same time if you are on Windows, or the "Command" key and the "A" key at the same time if you are on a Mac. Then, you need to press the "Ctrl" key and the "C" key on your keyboard at the same time if you are on Windows, or the "Command" key and the "C" key at the same time if you are on a Mac.