Call a PowerShell script with elevated privileges via command prompt

Problem:

I want to call my PowerShell script with elevated privileges in a non-administrator command prompt.
When I manually open the Command Prompt with 'Run as Administrator' and enter the line:

powershell -ExecutionPolicy Unrestricted -Command "Start-Process Powershell -Verb RunAs -Wait -ArgumentList '-NoProfile -ExecutionPolicy Unrestricted -File example.ps1 param1'"

My script PowerShell script runs just fine.

However, when I run it in a non-administrator command prompt, I see a PowerShell window appear for a split second and exits.

Any ideas on how to resolve this issue?

Tries

• Same thing happens, the window opens for a split second and then exits

https://stackoverflow.com/questions/48945292/run-powershell-script-via-batch-file-with-elevated-privileges

runas.exe /netonly /noprofile /user:domainadm@domain "powershell.exe -
noprofile -File "C:\Users\...\Desktop\Powershell_scripts\New-
ADuser\.ps1" -verb RunAs"

• Same thing happens here as well, the window opens for a split second and then exits

https://stackoverflow.com/questions/48838760/run-a-powershell-script-from-batch-file-with-elevated-privileges

powershell -Command "&{ Start-Process powershell -ArgumentList '-File example.ps1 param1' -Verb RunAs}"

• Same issue, the window opens for a split second and then exits

https://stackoverflow.com/questions/65679034/run-a-powershell-script-from-cmd-with-elevated-privilages-and-passing-parameters

PowerShell.exe -NoProfile -ExecutionPolicy Bypass -Command "Start-Process -FilePath PowerShell.exe -Verb RunAs -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File "example.ps1 param1"'"

CONTEXT: My PowerShell script is for downloading a NSIS Installer specified at param1

EDIT: Script code:

$param1 = $args[0]
Add-Type -AssemblyName Microsoft.VisualBasic
Add-Type -AssemblyName System.Windows.Forms

$installer = Start-Process -FilePath $param1 -PassThru
$installerWindowName = "Installer Setup"

while (-not ($installer.MainWindowTitle -match "$installerWindowName")) {
    Start-Sleep -Milliseconds 100
    $installer.Refresh()
}

<!-- language-all: sh -->

• On Windows, an elevated process launched from a non-elevated console invariably runs in a new window, which closes automatically when the elevated process exits.

  • For troubleshooting, you can place -NoExit before the -Command argument, which keeps the elevated PowerShell session open until you exit it manually, allowing you to inspect any errors that may have occurred.

• In Windows PowerShell (whose CLI is powershell.exe), an elevated process launches with $env:Windir\System32 as its working directory (fortunately, PowerShell (Core) 7+ now preserves the caller's working directory).

  • Therefore, using a relative path such as example.ps1 does not work, and you should pass a full path instead.
    • If your script relies on the working directory to be the same as the caller's, more work would be needed.

# Note the `"$PWD\example.ps1`" part
powershell -ExecutionPolicy Bypass -Command "Start-Process Powershell -Verb RunAs -Wait -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File `"$PWD\example.ps1`" param1'"