Your JDownloader installation is very old (stil Java 1.7). Try the following
Close JDownloader and check if there is a jre/java folder in your JDownloader folder. If yes, then rename it to something different and JDownloader will use the system installed java. Install Java8 on your system
oracle.com/technetwork/java/javase/downloads/jre8-downloads-2133155.html
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JD-Dev & Server-Admin
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