Update/Install latest Powershell version

profile.ps1

# Import the module in your profile so that you always have access to Update-Powershell in your session
Import-Module Pwsh.pms1

# In your session, you can now call Update-Powershell at any time

Pwsh.psm1

function Install-Powershell([string] $version)
{
    # in case the version was specified with a prefix, strip it
    $version = $version.Replace('v', '')

    Write-Host "Downloading $version..."
    $output = "PowerShell-$version-win-x64.msi"
    $url = "https://github.com/PowerShell/PowerShell/releases/download/v$version/PowerShell-$version-win-x64.msi"

    try {
        $wc = New-Object System.Net.WebClient
        $wc.DownloadFile($url, $output)
    } catch [System.Net.WebException],[System.IO.IOException] {
        throw "Couldn't download release: $($_.Exception.Message)";
    }

    Write-Host "Downloaded $output"
    Write-Host "Running update $output..."

    Start-Process $output

    # Close current session as installer will need all pwsh.exe instances killed
    $key = Read-Host "Close session (Y/n)?"
    if(!($key.ToLower() -eq "n")) {
        exit
    }
}

function Update-Powershell([bool] $includePreview = $false) {
    # Get the latest release tag
    $releasesUrl = "https://api.github.com/repos/Powershell/Powershell/releases"
    
    if($includePreview) {
        $releases = (Invoke-WebRequest $releasesUrl | ConvertFrom-Json) | Where-Object { $_.tag_name -like "*preview*"}
    } else {
        $releases = (Invoke-WebRequest $releasesUrl | ConvertFrom-Json) | Where-Object { $_.tag_name -notlike "*preview*"}
    }

    $latestRelease = $releases[0].tag_name.Replace('v', '')

    $installedRelease = $PSVersionTable.PSVersion.ToString()

    if ($installedRelease -eq $latestRelease) {
        Write-Host "You already have the latest version installed (v$installedRelease)"
        Write-Host "You can run Install-Powershell <version> to force-install a specific version"
    } else {
        # Download the installer and run it
        Install-Powershell $latestRelease
    }
}

Export-ModuleMember -Function *