winutil/functions/private/Install-WinUtilWinget.ps1

function Get-LatestHash {
    $shaUrl = ((Invoke-WebRequest $apiLatestUrl -UseBasicParsing | ConvertFrom-Json).assets | Where-Object { $_.name -match '^Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.txt$' }).browser_download_url

    $shaFile = Join-Path -Path $tempFolder -ChildPath 'Microsoft.DesktopAppInstaller_8wekyb3d8bbwe.txt'
    $WebClient.DownloadFile($shaUrl, $shaFile)

    Get-Content $shaFile
}

function Install-WinUtilWinget {

    <#

    .SYNOPSIS
        Installs Winget if it is not already installed

    .DESCRIPTION
        This function will download the latest version of winget and install it. If winget is already installed, it will do nothing.
    #>
    Try{
        Write-Host "Checking if Winget is Installed..."
        if (Test-WinUtilPackageManager -winget) {
            # Checks if winget executable exists and if the Windows Version is 1809 or higher
            Write-Host "Winget Already Installed"
            Start-Process -Verb runas -FilePath powershell.exe -ArgumentList "winget settings --enable InstallerHashOverride" -Wait -NoNewWindow
            return
        }

        # Gets the computer's information
        if ($null -eq $sync.ComputerInfo){
            $ComputerInfo = Get-ComputerInfo -ErrorAction Stop
        }
        Else {
            $ComputerInfo = $sync.ComputerInfo
        }

        if (($ComputerInfo.WindowsVersion) -lt "1809") {
            # Checks if Windows Version is too old for winget
            Write-Host "Winget is not supported on this version of Windows (Pre-1809)"
            return
        }

        Write-Host "Running Alternative Installers and Direct Installing"
        # Checks if winget is installed via Chocolatey
        
        Start-Process -Verb runas -FilePath powershell.exe -ArgumentList "choco install winget --force" -Wait -NoNewWindow
        if (Test-WinUtilPackageManager -winget) {
            # Checks if winget executable exists and if the Windows Version is 1809 or higher
            Write-Host "Winget Installed via Chocolatey"
            return
        } else {
            Write-Host "- Failed to install Winget via Chocolatey"
        }
    }
    Catch{
        throw [WingetFailedInstall]::new('Failed to install')
    }
}