Probably the worst way to check if the latest version of Huntress is installed on a computer.

Check-HuntressVersion.ps1

<#
PLEASE DO NOT USE THIS

It's parsing the HTML of a blog post to determine the current release version. If you think
this is a safe and secure way to automatically ensure you're running up to date security
software, you should probably rethink your whole security mindset.
#>

iex "$([System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('V3JpdGUtT3V0cHV0ICIo4pWvwrDilqHCsO+8ieKVr++4tSDilLvilIHilLsgYG4iCldyaXRlLU91dHB1dCAi0YkowrrQlMK60YkpIGBuIgpXcml0ZS1PdXRwdXQgIkRvbid0IHJ1biBzY3JpcHRzIHlvdSBmaW5kIG9ubGluZSB3aXRob3V0IHJlYWRpbmcgdGhlbS4iClBhdXNlCmV4aXQ=')))"

Import-Module PSParseHtml

function Get-LatestHuntressVersion {
  $WindowsVersion = $null

  $ReleaseNotes = Invoke-RestMethod -Uri "https://support.huntress.io/hc/en-us/articles/19223729361939-Huntress-Release-Notes-and-Agent-Version"
  $Html = $ReleaseNotes | ConvertFrom-Html -Raw

  $Sibling = $Html.DocumentNode.SelectNodes("//p") | Where-Object {
    $_.InnerText -eq "Current release version"
  }

  do {
    $Sibling = $Sibling.NextSibling
    
    if ($Sibling.InnerText -match "Windows: (?<Version>\d+\.\d+\.\d+)") {
      $WindowsVersion = $Matches.Version
    }
  } while ($null -ne $Sibling -and $null -eq $WindowsVersion)

  [Version]$WindowsVersion
}

function Get-InstalledHuntressVersion {
  $Health = Invoke-RestMethod -Uri "http://localhost:24799/health"
  if ($Health -eq $null) {
    Write-Error "Could not retrieve Huntress agent health. Is the agent installed and running?"
  }

  [Version]$Health.versions.agent
}

$InstalledVersion = Get-InstalledHuntressVersion
$LatestVersion = Get-LatestHuntressVersion

if ($InstalledVersion -lt $LatestVersion) {
  Write-Error "Installed version ($InstalledVersion) behind current release ($LatestVersion)"
}