Can you please send me the JDownloader.jar file to
support@jdownloader.org so I can check it?
after sending me the file, delete Core.jar, JDownloader.jar and the folders tmp and update and log
download JDownloader.jar
mega.nz/#!6FtSTAaa!iCcVpHl4hePgpj2q7EdcqGofDQKAt7rohGybzRCogv0
place it in folder and start again