At each start of JDownloader, a warning dialogue pops up, informing the user about a change in the program since the last start.
Since version 7.0.1.321 it's possible, to configure KasperskyFirewall not to check the change of a program.
Go to FilterRuleSet ( Settings → Firewall → Options in the “Filtersystem”section), select the desired application and click on the “change” button. There's a checkbox ” don't monitore changes in programm” at the bottom of the filterrule-dialogue.