AccountRight PC Edition 2026.6 MSI

Hi Mike,

I've checked the %localappdata% path for the SYSTEM account after a failed install attempt and there was no output of a SquirrelTemp folder.

For reference, this is the script I've used previously. When running as SYSTEM it fails, when running as a local administrator, it works fine. 

TLDR: Save the below as a .ps1 file, call it using `ScriptName.ps1 -version 2026.6`
It will download the latest version, and attempt to install it.

[CmdletBinding()]
param(
    # Version to install; this is passed through to URL and installer args.
    [Parameter(Mandatory = $true)]
    [string]$Version,

    # URL template must contain "{version}" placeholder.
    [string]$DownloadUrlTemplate = "https://download.myob.com/arl/MYOB_AccountRight_Setup_{version}.exe",

    # Extra installer arguments passed through as-is.
    [string[]]$InstallerArguments = @("-allusers")
)

$ErrorActionPreference = "Stop"

function Get-InstalledMyobVersion {
    param(
        [Parameter(Mandatory = $true)]
        [string]$TargetVersion
    )

    $uninstallPaths = @(
        "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*",
        "HKLM:\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\*"
    )

    $entries = foreach ($path in $uninstallPaths) {
        Get-ItemProperty -Path $path -ErrorAction SilentlyContinue
    }

    $expectedDisplayName = "MYOB AccountRight $TargetVersion"

    $myobEntry = $entries |
        Where-Object { $_.DisplayName -eq $expectedDisplayName } |
        Select-Object -First 1

    return $myobEntry.DisplayName
}


$installedVersion = Get-InstalledMyobVersion -TargetVersion $Version

if ($installedVersion) {
    Write-Output "MYOB version $Version is already installed. Nothing to do."
    exit 0
}

$downloadUrl = $DownloadUrlTemplate.Replace("{version}", $Version)
$tempInstaller = Join-Path 'c:\temp' ("MYOB_AccountRight_Setup_{0}.exe" -f $Version)

Write-Output "Download URL: $downloadUrl"
Write-Output "Temporary installer path: $tempInstaller"

if (-Not (Test-Path -Path $tempInstaller)) {
    Write-Output "Temporary installer not found at $tempInstaller. Will download."
    Write-Output "Downloading from $downloadUrl"
    try {
        Invoke-WebRequest -Uri $downloadUrl -OutFile $tempInstaller
    } catch {
        throw "Failed to download MYOB installer from $downloadUrl. $_"
    }
    if (-not (Test-Path -Path $tempInstaller)) {
        throw "Downloaded installer not found at $tempInstaller."
    }
} else {
    Write-Output "Temporary installer already exists at $tempInstaller. Will re-download."
}

Write-Output 'Swapping Install Mode...'
change user /install ##Tested to see if this would fix the SYSTEM issue on Terminal / Multi-user hosts. It doesn't

Write-Output "Running installer..."
$process = Start-Process -FilePath $tempInstaller -ArgumentList $InstallerArguments -Wait

if ($process.ExitCode -ne 0) {
    throw "MYOB installer failed with exit code $($process.ExitCode)."
}

$postInstallVersion = Get-InstalledMyobVersion -TargetVersion $Version
if ($postInstallVersion) {
    Write-Output "MYOB $Version installed successfully."
    Remove-Item -Path $tempInstaller -Force
} else {
    throw "Install completed but expected app name 'MYOB AccountRight $Version' was not detected."
}