Download ALL artifacts for a given deployment from Octopus Deploy to the artifacts directory

octo-artifacts.ps1

# Try it in powershell...
[Reflection.Assembly]::LoadFile("C:\Program Files\Octopus Deploy\Tentacle\Newtonsoft.Json.dll")
[Reflection.Assembly]::LoadFile("C:\Program Files\Octopus Deploy\Tentacle\Octopus.Client.dll")
[Reflection.Assembly]::LoadFile("C:\Program Files\Octopus Deploy\Tentacle\Octopus.Platform.dll")

# Basic data
Write-Host "Setup..."
$octoKey=" Your API Key"
$octoUser=" Your user name"
$octoId=" Your deployment id, ie (deployments-1492)"
$octoURI=" Base Octopus URL"

#Compose URL
$octoURL=$octoURI+$octoUser

# HTTP header used for REST-API 
Write-Host "Header..."
$header=@{}
$header.Add("X-Octopus-ApiKey",$octoKey)


# REST Query for artifacts associated with the deployment-id
Write-Host "Query Artifacts..."
$request=$octoURL+"/api/artifacts?regarding=$octoId"
$restResponse=Invoke-RestMethod -Uri $request -Headers $header


Write-Host "List Items..."
$items=$restResponse.Items

$artifactsDir="artifacts"
if(!(Test-Path -Path $artifactsDir )){
  New-Item -ItemType directory -Path $artifactsDir | Out-Null
}


for ($i=0; $i -lt $items.Length; $i++) {
 
 $artifactURI=$octoURI+$items[$i].Links.Content
 $artifact=$artifactsDir+"\"+$items[$i].Filename
 
  Write-host ("Download[{0}] => [{1}]..." -f $artifactURI, $artifact)

  $artifactResponse=Invoke-WebRequest -Uri $artifactURI -Outfile $artifact -Headers $header
  $artifactResponse


}

Write-Host "Finish..."

If you prefer C#:
https://gist.github.com/rpresser/eb63b732932a2e9bcbdd0d7c8c7f9eca