Java Update Breaks JDownloader
If JDownloader breaks when you update Java, please try
Java Problems - JD Hangs, Freezes, Doesn't Start
Your security software can cause this.
If you are using an antivirus or firewall that requires you to create exceptions for jdownloader, java, or javaw, updating JD or java should cause the security software to start blocking again.
When a program has changed, well designed security software will ask whether this is an update of the same software. If it is an update, the old exception should be applied to the new version as well.
In any case, the security software must tell you when it is about to block a program. If you cannot set this up, then the security software
should be uninstalled.
Read
Choosing and installing security software for more information.