Run the installer manually as Administrator: right-click → Run as administrator . If it works, UAC was the blocker.
Always right-click the installer and select Run as administrator . If the issue persists, temporarily lower UAC to "Notify me only when apps try to make changes" (not recommended permanently). Cause 2: Windows SmartScreen / Defender Blocking Technical Explanation: FileZilla installer is code-signed but not always with an EV (Extended Validation) certificate. SmartScreen may flag it as "unrecognized," especially if downloaded via HTTP (not HTTPS) or from a mirror. filezilla not installing on windows 11
Check Windows Security → Virus & threat protection → Ransomware protection → Controlled folder access → Block history . Look for FileZilla installer. Run the installer manually as Administrator: right-click →
Check if SmartScreen shows a blue or yellow screen saying "Windows protected your PC." Click More info → Run anyway . If the issue persists, temporarily lower UAC to