I have Java enabled but ganttproject.exe won’t run. I double click on it but it won’t start. I can see in the process ganttproject.exe start but it closes in about a second.
Before we dig into the details, we need to be sure that Java Runtime is really installed and is not corrupted on your system. Please download it from https://java.com and install. If you already did exactly that (downloaded and installed) then please type
java -version in the command prompt and post the output.