^ Isn't jdownloader bloated full of malware and adware by now? Or are you using an older version before they turned evil?
I use new version.
When installing, removing a check of the malware and the adware , it's no problem.
But it's fact that there is warning of security software at the time of installation.
I did system scan after installation, but there were no problems.
It was checked with a net(2ch.net) just in case, but it doesn't seem necessary to worry about it.