Update-PowerShell.ps1

$currentVersion = $PSVersionTable.PSVersion.Major
if ($currentVersion -ge 5) {
    Write-Host "PowerShell is updated."
    return
}
    
$url = "https://raw.githubusercontent.com/jborean93/ansible-windows/master/scripts/Upgrade-PowerShell.ps1"
$file = "$env:temp\Upgrade-PowerShell.ps1"
    
(New-Object -TypeName System.Net.WebClient).DownloadFile($url, $file)
Write-Host "Update script is downloaded."

$currentPolicy = Get-ExecutionPolicy -List | Where-Object Scope -eq "LocalMachine" | Select-Object ExecutionPolicy
if ($currentPolicy -ne "Unrestricted") {
    Set-ExecutionPolicy -ExecutionPolicy Unrestricted -Force
}

&$file -Version 5.1 -Verbose

Set-ExecutionPolicy -ExecutionPolicy $currentPolicy