The message “qbittorrent can’t be opened because Apple cannot check it for malicious software” occurs because macOS Gatekeeper cannot verify the app's developer identity or notarization status. This is common for apps like qBittorrent that are not downloaded from the App Store or are unsigned by an identified developer. To bypass this on Mac:
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Open System Settings (or System Preferences) and go to Privacy & Security (or Security & Privacy).
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Under the General tab, there should be an option to "Open Anyway" for qBittorrent, which allows you to override the block.
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If that option doesn’t appear or the app still won't open, use Terminal and run this command to remove the quarantine attribute:
sudo xattr -rd com.apple.quarantine /Applications/qbittorrent.app/
Enter your password when prompted. This removes the Gatekeeper flag and should let you open qBittorrent normally. These steps are the typical way to fix this issue on macOS and have worked for many users with qBittorrent and other similar apps with this security warning.
