install_zeek_agent.ps1

# Define the target version and URL
$TargetVersion = "2.3.0"
$DownloadUrl = "https://github.com/zeek/zeek-agent-v2/releases/download/v$TargetVersion/zeek-agent-$TargetVersion.msi"
$MsiPath = "$env:TEMP\zeek-agent-$TargetVersion.msi"

# Function to get currently installed Zeek-Agent version
function Get-ZeekVersion {
    $ver = Get-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | 
           Where-Object { $_.DisplayName -like "*Zeek-Agent*" } | 
           Select-Object -ExpandProperty DisplayVersion -ErrorAction SilentlyContinue
    return $ver
}

$CurrentVersion = Get-ZeekVersion

if ($null -eq $CurrentVersion -or [version]$CurrentVersion -lt [version]$TargetVersion) {
    Write-Output "Installing/Upgrading Zeek-Agent to $TargetVersion. (Current: $CurrentVersion)"
    
    # Download MSI
    Invoke-WebRequest -Uri $DownloadUrl -OutFile $MsiPath
    
    # Silent Installation
    Start-Process msiexec.exe -ArgumentList "/i `"$MsiPath`" /qn /norestart" -Wait
    
    # Cleanup
    Remove-Item $MsiPath -ErrorAction SilentlyContinue
    Write-Output "Installation complete."
} else {
    Write-Output "Zeek-Agent is already up to date ($CurrentVersion)."
}