Same problem for me, have tried suggestions on forum including opening individual packages and using Terminal to open.
I’m using MacOS Sierra 10.12.6, Java says it is up to date.
This is the log I get in console when using Terminal to try and open it if anybody knows about this stuff and can get an answer from it.
Summary
Last login: Sat Aug 17 19:16:37 on ttys000
users-MacBook-Air:~ user$ /Applications/Steinberg\ Download\ Assistant/Steinberg\ Download\ Assistant.app/Contents/MacOS/Steinberg\ Download\ Assistant ; exit;
log4j:WARN No appenders could be found for logger (net.steinberg.elicenser.download.gui.common.FXMLLoaderFactory).
log4j:WARN Please initialize the log4j system properly.
Exception in Application init method
Exception in thread “main” java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51)
Caused by: java.lang.RuntimeException: Exception in Application init method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:912)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.slf4j.impl.Log4jLoggerFactory loaded from file:/Library/Java/Extensions/slf4j-log4j12-1.5.8.jar). If you are using WebLogic you will need to add ‘org.slf4j’ to prefer-application-packages in WEB-INF/weblogic.xml: org.slf4j.impl.Log4jLoggerFactory
at org.springframework.util.Assert.instanceCheckFailed(Assert.java:389)
at org.springframework.util.Assert.isInstanceOf(Assert.java:327)
at org.springframework.boot.logging.logback.LogbackLoggingSystem.getLoggerContext(LogbackLoggingSystem.java:274)
at org.springframework.boot.logging.logback.LogbackLoggingSystem.beforeInitialize(LogbackLoggingSystem.java:98)
at org.springframework.boot.logging.LoggingApplicationListener.onApplicationStartingEvent(LoggingApplicationListener.java:231)
at org.springframework.boot.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:210)
at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:69)
at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:292)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
at net.steinberg.elicenser.download.AbstractJavaFxApplicationSupport.init(AbstractJavaFxApplicationSupport.java:29)
at net.steinberg.elicenser.download.DownloaderManagerApp.init(DownloaderManagerApp.java:64)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:841)
… 2 more
2019-08-17 19:17:26.236 Steinberg Download Assistant[746:18830] Steinberg Download Assistant:Failed to launch JVM
logout
Saving session…
…copying shared history…
…saving history…truncating history files…
…completed.
[Process completed]