This is a common issue on macOS. Usually, this means a permission was missed. Navigate to System Preferences > Privacy & Security > Full Disk Access and ensure FortiClient is checked.
Here’s a step-by-step guide to downloading for macOS . forticlient 6.4 3 download macos
: Always verify the checksum (SHA256) of your downloaded DMG against Fortinet’s published hash. If your security policy allows, consider expressing your Mac to version 6.4.10 (last stable 6.4.x build) for critical vulnerability fixes. This is a common issue on macOS