Sharepoint download all including sub folders

#Load SharePoint CSOM Assemblies
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.dll"
Add-Type -Path "C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\16\ISAPI\Microsoft.SharePoint.Client.Runtime.dll"

Function Download-AllFilesFromLibrary()
{
    param
    (
        [Parameter(Mandatory=$true)] [string] $SiteURL,
        [Parameter(Mandatory=$true)] [Microsoft.SharePoint.Client.Folder] $SourceFolder,
        [Parameter(Mandatory=$true)] [string] $TargetFolder
    )
    Try {

        #Create Local Folder, if it doesn't exist
        $FolderName = ($SourceFolder.ServerRelativeURL) -replace "/","\"
        $LocalFolder = $TargetFolder + $FolderName
        If (!(Test-Path -Path $LocalFolder)) {
                New-Item -ItemType Directory -Path $LocalFolder | Out-Null
        }

        #Get all Files from the folder
        $FilesColl = $SourceFolder.Files
        $Ctx.Load($FilesColl)
        $Ctx.ExecuteQuery()

        #Iterate through each file and download
        Foreach($File in $FilesColl)
        {
            $TargetFile = $LocalFolder+"\"+$File.Name
            #Download the file
            $FileInfo = [Microsoft.SharePoint.Client.File]::OpenBinaryDirect($Ctx,$File.ServerRelativeURL)
            $WriteStream = [System.IO.File]::Open($TargetFile,[System.IO.FileMode]::Create)
            $FileInfo.Stream.CopyTo($WriteStream)
            $WriteStream.Close()
            write-host -f Green "Downloaded File:"$TargetFile
        }

        #Process Sub Folders
        $SubFolders = $SourceFolder.Folders
        $Ctx.Load($SubFolders)
        $Ctx.ExecuteQuery()
        Foreach($Folder in $SubFolders)
        {
            If($Folder.Name -ne "Forms")
            {
                #Call the function recursively
                Download-AllFilesFromLibrary -SiteURL $SiteURL -SourceFolder $Folder -TargetFolder $TargetFolder
            }
        }
  }
    Catch {
        write-host -f Red "Error Downloading Files from Library!" $_.Exception.Message
    }
}

#Set parameter values
$SiteURL="https://crescent.sharepoint.com/sites/sales/"
$LibraryName="Documents"
$TargetFolder="C:\Docs"

#Setup Credentials to connect
$Cred= Get-Credential
$Credentials = New-Object Microsoft.SharePoint.Client.SharePointOnlineCredentials($Cred.Username, $Cred.Password)

#Setup the context
$Ctx = New-Object Microsoft.SharePoint.Client.ClientContext($SiteURL)
$Ctx.Credentials = $Credentials

#Get the Library
$List = $Ctx.Web.Lists.GetByTitle($LibraryName)
$Ctx.Load($List)
$Ctx.Load($List.RootFolder)
$Ctx.ExecuteQuery()


#Call the function to download file
Download-AllFilesFromLibrary -SiteURL $SiteURL -SourceFolder $List.RootFolder -TargetFolder $TargetFolder


#Read more: http://www.sharepointdiary.com/2017/03/sharepoint-online-download-all-files-from-document-library-using-powershell.html#ixzz5u3iP1Hx1