$currentIdentity = [Security.Principal.WindowsIdentity]::GetCurrent()
$currentPrincipal = [Security.Principal.WindowsPrincipal]::new($currentIdentity)
$isElevated = $currentPrincipal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)

if (-not $isElevated)
{
    $shellPath = Join-Path $PSHOME 'pwsh.exe'

    if (-not (Test-Path $shellPath))
    {
        $shellPath = 'powershell.exe'
    }

    Start-Process -FilePath $shellPath -Verb RunAs -ArgumentList @(
        '-ExecutionPolicy',
        'Bypass',
        '-File',
        $PSCommandPath
    )

    exit
}

$targetPath = 'C:\Windows\System32\OpenSSH\LICENSE.txt'

Set-Content -Path $targetPath -Value 'hello world'