Windows 11 - Filezilla Not Installing On

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.

Compare file size and SHA-256 checksum of the downloaded .exe with the official values. filezilla not installing on windows 11

Check Windows Security → Device security → Core isolation details . If Memory Integrity is On , try turning it off temporarily. Always right-click the installer and select Run as

Temporarily disable real-time protection. If installation succeeds, the AV is the cause. SmartScreen may flag it as "unrecognized," especially if

winget install -e --id FileZilla.Client.FileZilla

Check if SmartScreen shows a blue or yellow screen saying "Windows protected your PC." Click More info → Run anyway .

Check Windows Security → Virus & threat protection → Ransomware protection → Controlled folder access → Block history . Look for FileZilla installer.