www.SunnyLaneLive.com
Compare file size and SHA-256 checksum of the downloaded .exe with the official values.
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.
winget install -e --id FileZilla.Client.FileZilla filezilla not installing on windows 11
Check if SmartScreen shows a blue or yellow screen saying "Windows protected your PC." Click More info → Run anyway .
Run the installer manually as Administrator: right-click → Run as administrator . If it works, UAC was the blocker. Compare file size and SHA-256 checksum of the downloaded
Check Windows Security → Virus & threat protection → Ransomware protection → Controlled folder access → Block history . Look for FileZilla installer.
| Method | Pros | Cons | |--------|------|------| | | No installation, runs from any folder | No shell integration, no FTP:// handler | | Winget (Windows Package Manager) | Bypasses most security prompts | Requires admin and Winget installed | | Chocolatey | Automated, silent install | Requires Chocolatey setup | | Install in Windows Sandbox | Isolated from host OS | Sandbox resets after closure | Cause 2: Windows SmartScreen / Defender Blocking Technical
Temporarily disable real-time protection. If installation succeeds, the AV is the cause.