The official JDownloader site (.org) was compromised. Attackers modified the alternative download page and replaced the Windows .exe installers as well as the Linux shell installer. The tampered Windows files lack valid digital signatures, display fake publisher names such as Zipline LLC, The Water Team, or Peace Team, and are flagged by Windows Defender and SmartScreen as malicious. The Linux shell installer now contains harmful code. What remains safe: >macOS installers >The main JDownloader.jar file >All existing app updates (running installations are unaffected) >Third-party packages such as Flatpak, Winget, or Snap (these use external hosting and unchanged manifests) The JDownloader developers have publicly confirmed the breach on Reddit and are working to restore the site. Do not download any Windows .exe or Linux shell files directly from jdownloader. org until they post an official all-clear. If you downloaded and ran a recent installer from the site in the past few days, run a full system scan with your antivirus and monitor for unusual activity.