[JUpunpacker]

I guess I could try to download manually, but during the update process it does actually download the update, its only when installing that it fails.
If I leave all settings in KTS the same, and check the box "do not monitor activity" ONLY for jdownloader.jar (self/jdu), then it installs fine.
If I go back into the same jdownloader.jar file settings and allow system monitor again for it, then the update fails.

Or do you mean jdownloader.jar tries to d/l another file again and system monitor stops it, so I should try to d/l that file manually? If yes, maybe pm link.