Download and install Seq (https://getseq.net/). Can be used by Azure Resource Manager template. Use RawGit to access the file with proper Content-Type headers - https://rawgit.com/

Install-Seq.ps1

[CmdletBinding()]
param (
    [string]$SeqVersion,
    [string]$SeqPort
)

$installBasePath = "C:\Install\"
$global:seqDataPath = "C:\ProgramData\Seq"

function Write-Log
{
  param (
    [string] $message
  )

  $timestamp = ([System.DateTime]::UTCNow).ToString("yyyy'-'MM'-'dd'T'HH':'mm':'ss")
  Write-Output "[$timestamp] $message"
}

function Add-InstallLocation
{
  Write-Log "======================================"
  Write-Log " Create Install Location"
  Write-Log ""

  if (!(Test-Path $installBasePath))
  {
    Write-Log "Creating installation folder at '$installBasePath' ..."
    New-Item -ItemType Directory -Path $installBasePath | Out-Null
    Write-Log "done."
  }
  else
  {
    Write-Log "Installation folder at '$installBasePath' already exists."
  }

  Write-Log ""
}


function Add-DataDisk
{
  Write-Log "======================================"
  Write-Log " Create Data Disk"
  Write-Log ""

  $driveLetters = @('F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z')
  $allocateDriveLetters = (Get-Partition).DriveLetter
  $availableDriveLetters = $driveLetters |? {$_ -notin $allocateDriveLetters }
  $disk = (Get-Disk |? { $_.PartitionStyle -eq 'RAW' })[0]
  Write-Log "Found attached data disk with RAW partition."

  $driveLetter = $availableDriveLetters[0].ToString()
  Write-Log "Assigning drive letter $driveLetter."
  Write-Log "Formatting ..."
  $disk | Initialize-Disk -PartitionStyle MBR -PassThru | New-Partition -UseMaximumSize -DriveLetter $driveLetter | Format-Volume -FileSystem NTFS -NewFileSystemLabel "Seq-DataDisk" -Confirm:$false -Force | Out-Null
  Write-Log "done."

  $path = $driveLetter + ':\SeqData'
  Write-Log "Creating '$path' ..."
  New-Item -Path $path -ItemType Directory | Out-Null
  $global:seqDataPath = $path
  Write-Log "done."

  Write-Log "done."
  Write-Log ""
}

function Install-Seq
{
  $msiFileName = "Seq-$SeqVersion.msi"
  $downloadUrl = "https://getseq.net/Download/Begin?version=$SeqVersion"
  $msiPath = $installBasePath + $msiFileName
  $msiLogPath = $installBasePath + $msiFileName + '.log'
  $installerLogPath = $installBasePath + 'Install-Seq.ps1.log'

  Write-Log "======================================"
  Write-Log " Install Seq"
  Write-Log ""

  Write-Log "Downloading Seq installer '$downloadUrl' to '$msiPath' ..."
  [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12
  Invoke-WebRequest -Uri $downloadUrl -Method GET -OutFile $msiPath
  Write-Log "done."

  Write-Log "Installing via '$msiPath' ..."
  $exe = 'msiexec.exe'
  $args = @(
    '/qn',
    '/i', $msiPath,
    '/l*v', $msiLogPath
  )
  $output = .$exe $args
  $output  | %{ Write-Log "$_" }
  Write-Log "done."

  Write-Log ""
}

function Set-SeqConfiguration
{
  Write-Log "======================================"
  Write-Log " Configure Seq"
  Write-Log ""

  $exe = 'C:\Program Files\Seq\Seq.exe'

  $count = 0
  while(!(Test-Path $exe) -and $count -lt 5)
  {
    Write-Log "$exe - not available yet ... waiting 10s ..."
    Start-Sleep -s 10
    $count = $count + 1
  }

  Write-Log "Configure and start Seq instance ..."
  $args = @(
      "install",
      "--listen=http://localhost:$SeqPort",
      "--storage=$global:seqDataPath"
  )

  $output = .$exe $args
  $output | %{ Write-Log "$_" }
  Write-Log "done."

  Write-Log ""
}

function Set-ConfigureFirewall
{
  Write-Log "======================================"
  Write-Log " Configure Firewall"
  Write-Log ""

  $firewallRuleName = "Allow_Port$($SeqPort)_HTTP"

  if ((Get-NetFirewallRule -Name $firewallRuleName -ErrorAction Ignore) -eq $null)
  {
    Write-Log "Creating firewall rule to allow port $SeqPort HTTP traffic ..."
    $firewallRule = @{
      Name=$firewallRuleName
      DisplayName ="Allow Port $SeqPort (HTTP)"
      Description="Port $SeqPort for HTTP traffic"
      Direction='Inbound'
      Protocol='TCP'
      LocalPort=([int]$SeqPort)
      Enabled='True'
      Profile='Any'
      Action='Allow'
    }

    New-NetFirewallRule @firewallRule | %{ Write-Log "$_" }
    Write-Log "done."
  }
  else
  {
    Write-Log "Firewall rule to allow port $SeqPort HTTP traffic already exists."
  }

  Write-Log ""
}

try
{
  Write-Log "======================================"
  Write-Log " Installing Seq"
  Write-Log "======================================"
  Write-Log ""

  Add-DataDisk

  Add-InstallLocation
  Install-Seq
  Set-SeqConfiguration
  Set-ConfigureFirewall

  Write-Log "Installation successful."
  Write-Log ""
}
catch
{
  Write-Log $_
}

Restart-Computer