PowerShell 6 is open-source and maintained in a public repository on GitHub. There are frequent releases. Here is a way how you can find out the download URL for the latest available PowerShell 6 release:

$AllProtocols = [Net.SecurityProtocolType]'Ssl3,Tls,Tls11,Tls12'
[Net.ServicePointManager]::SecurityProtocol = $AllProtocols 

# get the URL for the latest PowerShell 6 release
$url = "https://github.com/PowerShell/PowerShell/releases/latest?dummy=$(Get-Random)"
$request = [System.Net.WebRequest]::Create($url)
$response = $request.GetResponse()
$realURL = $response.GetResponseHeader("Location")

# get the current version from that URL
$v = ($realURL -split '/v')[-1]

# create the download URL for the release of choice
# (adjust the end part to target the desired platform, architecture, and package format)
$platform = "win-x64.zip"
$static = "https://github.com/PowerShell/PowerShell/releases/download"
$url = "$static/v$version/PowerShell-$version-$platform"

This chunk of code generates the download URL for the Windows 64-bit release in ZIP format. If you’d like to download a different release, simply adjust the platform part defined in $platform.

Once you have the download URL, you can automate the rest accordingly: download the ZIP file, unblock and unpack it, then launch PowerShell 6:

# define the place to download to
$destinationFile = "$env:temp\PS6\powershell6.zip"
$destinationFolder = Split-Path -Path $destinationFile

# create destination folder if it is not present
$existsDestination = Test-Path -Path $destinationFolder
if ($existsDestination -eq $false)
    $null = New-Item -Path $destinationFolder -Force -ItemType Directory

# download file
Invoke-WebRequest -Uri $url -OutFile $destinationFile
# unblock downloaded file
Unblock-File -Path $destinationFile
# extract file
Expand-Archive -Path $destinationFile -DestinationPath $destinationFolder -Force

Finally, let’s create a shortcut on your desktop that points to PowerShell6 and lets you easily launch the shell:

# place a shortcut on your desktop
$path = "$Home\Desktop\powershell6.lnk"
$obj = New-Object -ComObject WScript.Shell
$scut = $obj.CreateShortcut($path)
$scut.TargetPath = "$destinationFolder\pwsh.exe"
$scut.IconLocation = "$destinationFolder\pwsh.exe,0"
$scut.WorkingDirectory = "$home\Documents"

# run PowerShell 6
Invoke-Item -Path $path

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