How To Install FortiClient VPN Silently on Windows

# Don't forget to replace the MSI instaler file name in the PowerShell script to fit with yours.
# Declare variables
$DownloadLink = "https://filestore.fortinet.com/forticlient/downloads/FortiClientVPNSetup_7.0.1.0083_x64.zip.zip"
$InstallerPath = "C:\Windows\Temp\installer.zip"

# Download and install the app
Write-Output "Downloading the installer..."
[System.Net.WebClient]::new().DownloadFile($DownloadLink, $InstallerPath)

# Extract the downloaded zip file
Expand-Archive -Path "C:\Windows\Temp\installer.zip" "C:\Windows\Temp" -Force

# Install the app silently
Write-Output "Installing the app silently..."
try {
    $args = "/i `"C:\Windows\Temp\FortiClientVPN.msi`" /quiet /norestart"
    Start-Process -FilePath "msiexec.exe" -ArgumentList $args -Wait -ErrorAction Stop
} catch {
    Write-Output "The installation failed. Error: $($_.Exception.Message)"
}

# Verify Installation
Write-Output "Verifying the installation..."
$RegKeys = @(
    'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\',
    'HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\'
)
$AppInstalled = $RegKeys | Get-ChildItem -ErrorAction SilentlyContinue | 
    Get-ItemProperty -ErrorAction SilentlyContinue | 
    Where-Object { $_.DisplayName -like '*FortiClien*' }

if ($AppInstalled) {
    Write-Output "The app is installed. Version: $($AppInstalled.DisplayVersion)"
} else {
    Write-Output "Failed to verify installation status."
}

# Cleanup
Write-Output "Cleaning up temporary files..."
Remove-Item -Path $InstallerPath -Force
Remove-Item -Path "C:\Windows\Temp\FortiClientVPN.msi" -Force
Write-Output "Temporary files cleaned up successfully."
Write-Output "All tasks completed successfully."