How to install JDOWNLOADER

Hello

For several days I try to install JDownloader, at least using their API.
I followed their tutorial https://board.jdownloader.org/showthread.php?t=71980

The service starts and there are no errors when launching the service but in the beginning “java -jar /opt/jdownloader/JDownloader.jar -norestart”
The config for the myjdownloader account is not displayed.

Would someone have the solution?