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[malcaraz (Manuel)]

AFAIK, GP is supported with Java 11. Your are using Java 19.
Try v11 and tell us… ; )

MacOS Monterey et puce M1 max

The file looks good. To follow your advice, I started by installing: bellsoft-jdk18.0.1+12-macos-aarch64, You don’t want Java 18, you want Java 11. You don’t need jdk, you need JRE. And you need “full”, not the standard. Here is the link: https://download.bell-sw.com/java/11.0.15.1+2/bellsoft-jre11.0.15.1+2-macos-aarch64-full.dmg without any result unfortunately Did you run GanttProject from ZIP distro?