How to Uninstall the Atera Agent via PowerShell Script

Purpose

This article explains how to completely remove the Atera Agent (and any associated Splashtop components) from a Windows computer using a PowerShell script.

This process is typically required when:

  • An agent installation has become corrupted or stuck.
  • A device was previously managed under a different customer.
  • The Atera trial or old deployment needs to be fully cleaned up before reinstalling.

When to Use

Use this procedure before reinstalling the Atera Agent, particularly if:

  • The device shows as “Offline” or “Unmanaged” in the Atera console even though the agent is installed.
  • The machine was renamed or reassigned to a new customer site.
  • Previous uninstall attempts (via Control Panel or MSI uninstall) failed.

Steps to Remove the Atera Agent

1. Reboot and Prepare the System

Before running the script:

  1. Rename the computer if needed (for reassignment or cleanup).
  2. Reboot the device to ensure no agent processes are stuck.

2. Open PowerShell ISE as Administrator

  1. Press Start, type PowerShell ISE, right-click, and choose Run as Administrator.
  2. Create a new blank script window.

3. Copy and Paste the Uninstall Script

Paste the full script from Atera’s documentation (linked below):

👉 Atera Official Script Reference

Or use the version below (verified and compatible for Ultrex use):

Function Get-UninstallCodes ([string]$DisplayName) {
‘HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall’, ‘HKLM:SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall’ | ForEach-Object {
Get-ChildItem -Path $_ -ErrorAction SilentlyContinue | ForEach-Object {
If ( $(Get-ItemProperty -Path $_.PSPath -Name ‘DisplayName’ -ErrorAction SilentlyContinue) -and ($(Get-ItemPropertyValue -Path $_.PSPath -Name ‘DisplayName’ -ErrorAction SilentlyContinue) -eq $DisplayName) ) {
$str = (Get-ItemPropertyValue -Path $_.PSPath -Name ‘UninstallString’)
$UninstallCodes.Add($str.Substring(($str.Length – 37),36)) | Out-Null
}}}}

Function Get-ProductKeys ([string]$ProductName) {
Get-ChildItem -Path ‘HKCR:Installer\Products’ | ForEach-Object {
If ( $(Get-ItemProperty -Path $_.PSPath -Name ‘ProductName’ -ErrorAction SilentlyContinue) -and ($(Get-ItemPropertyValue -Path $_.PSPath -Name ‘ProductName’ -ErrorAction SilentlyContinue) -eq $ProductName) ) {
$ProductKeys.Add($_.PSPath.Substring(($_.PSPath.Length – 32))) | Out-Null
}}}

Function Get-ServiceStatus ([string]$Name) { (Get-Service -Name $Name -ErrorAction SilentlyContinue).Status }
Function Stop-RunningService ([string]$Name) { If ( $(Get-ServiceStatus -Name $Name) -eq “Running” ) { Write-Output “Stopping : ${Name} service” ; Stop-Service -Name $Name -Force }}
Function Remove-StoppedService ([string]$Name) { $s = (Get-ServiceStatus -Name $Name); If ( $s ) { If ( $s -eq “Stopped” ) { Write-Output “Deleting : ${Name} service”; Start-Process “sc.exe” -ArgumentList “delete ${Name}” -Wait } } Else { Write-Output “Not Found: ${Name} service” }}
Function Stop-RunningProcess ([string]$Name) { $p = (Get-Process -Name $_ -ErrorAction SilentlyContinue); If ( $p ) { Write-Output “Stopping : ${Name}.exe” ; $p | Stop-Process -Force } Else { Write-Output “Not Found: ${Name}.exe is not running”}}
Function Remove-Path ([string]$Path) { If ( Test-Path $Path ) { Write-Output “Deleting : ${Path}”; Remove-Item $Path -Recurse -Force } Else { Write-Output “Not Found: ${Path}” }}
Function Get-AllExeFiles ([string]$Path) { If ( Test-Path $Path ) { Get-ChildItem -Path $Path -Filter *.exe -Recurse | ForEach-Object { $ExeFiles.Add($_.BaseName) | Out-Null } }}

New-PSDrive -Name HKCR -PSProvider Registry -Root HKEY_CLASSES_ROOT | Out-Null

$UninstallCodes = New-Object System.Collections.ArrayList
‘AteraAgent’, ‘Splashtop for RMM’, ‘Splashtop Streamer’ | ForEach-Object { Get-UninstallCodes -DisplayName $_ }

$ProductKeys = New-Object System.Collections.ArrayList
‘AteraAgent’, ‘Splashtop for RMM’, ‘Splashtop Streamer’ | ForEach-Object { Get-ProductKeys -ProductName $_ }

$Directories = @(
“${Env:ProgramFiles}\ATERA Networks”,
“${Env:ProgramFiles(x86)}\ATERA Networks”,
“${Env:ProgramFiles}\Splashtop\Splashtop Remote\Server”,
“${Env:ProgramFiles(x86)}\Splashtop\Splashtop Remote\Server”,
“${Env:ProgramFiles}\Splashtop\Splashtop Software Updater”,
“${Env:ProgramFiles(x86)}\Splashtop\Splashtop Software Updater”,
“${Env:ProgramData}\Splashtop\Splashtop Software Updater”
)

$ExeFiles = New-Object System.Collections.ArrayList
“${Env:ProgramFiles}\ATERA Networks” | ForEach-Object { Get-AllExeFiles -Path $_ }

$ServiceList = @(‘AteraAgent’,’SplashtopRemoteService’,’SSUService’)

$RegistryKeys = @(
‘HKLM:SOFTWARE\ATERA Networks’,
‘HKLM:SOFTWARE\Splashtop Inc.’,
‘HKLM:SOFTWARE\WOW6432Node\Splashtop Inc.’
)

$UninstallCodes | ForEach-Object { Write-Output “Uninstall: ${}” ; Start-Process “msiexec.exe” -ArgumentList “/X{${}} /qn” -Wait }

$ServiceList | ForEach-Object { Stop-RunningService -Name $_ }

$ExeFiles.Add(‘reg’) | Out-Null
$ExeFiles | ForEach-Object { Stop-RunningProcess $_ }

$ServiceList | ForEach-Object { Remove-StoppedService -Name $_ }

$ProductKeys | ForEach-Object { Remove-Path -Path “HKCR:Installer\Products\${_}” }

Remove-PSDrive -Name HKCR

$RegistryKeys | ForEach-Object { Remove-Path -Path $_ }

$Directories | ForEach-Object { Remove-Path -Path $_ }

4. Run the Script

  1. Click the Run Script (F5) button.
  2. Wait for it to finish — it may take a few minutes.
  3. Review the output for any errors or missing paths.

5. Reboot the Computer

After the script completes, reboot again.

This ensures all registry keys and service entries are cleared.

6. Reinstall the Atera Agent

Once the machine has restarted:

  • Use the CMD installation method from Atera instead of the .MSI installer. This ensures the device correctly registers to the right customer/site in your Atera dashboard.

Example CMD install:

msiexec /i “AteraAgentSetup.msi” CUSTOMER_ID=123456 /qn

Final Notes

  • Always perform a reboot before and after running the script.
  • Confirm that all Atera and Splashtop folders are gone before reinstalling.
  • For stubborn removals, re-run PowerShell as Admin and execute the script again.