Get-FileFromWeb.ps1

# From https://gist.github.com/ChrisStro/37444dd012f79592080bd46223e27adc
# and modified to skip if file exists.
function Get-FileFromWeb {
    param (
        # Parameter help description
        [Parameter(Mandatory)]
        [string]$URL,
  
        # Parameter help description
        [Parameter(Mandatory)]
        [string]$OutFile,

        [bool]$SkipIfExist = $false
    )
    Begin {
        function Show-Progress {
            param (
                # Enter total value
                [Parameter(Mandatory)]
                [Single]$TotalValue,
        
                # Enter current value
                [Parameter(Mandatory)]
                [Single]$CurrentValue,
        
                # Enter custom progresstext
                [Parameter(Mandatory)]
                [string]$ProgressText,
        
                # Enter value suffix
                [Parameter()]
                [string]$ValueSuffix,
        
                # Enter bar lengh suffix
                [Parameter()]
                [int]$BarSize = 40,

                # show complete bar
                [Parameter()]
                [switch]$Complete
            )
            
            # calc %
            $percent = $CurrentValue / $TotalValue
            $percentComplete = $percent * 100
            if ($ValueSuffix) {
                $ValueSuffix = " $ValueSuffix" # add space in front
            }
            if ($psISE) {
                Write-Progress "$ProgressText $CurrentValue$ValueSuffix of $TotalValue$ValueSuffix" -id 0 -percentComplete $percentComplete            
            }
            else {
                # build progressbar with string function
                $curBarSize = $BarSize * $percent
                $progbar = ""
                $progbar = $progbar.PadRight($curBarSize,[char]9608)
                $progbar = $progbar.PadRight($BarSize,[char]9617)
        
                if (!$Complete.IsPresent) {
                    Write-Host -NoNewLine "`r$ProgressText $progbar [ $($CurrentValue.ToString("#.###").PadLeft($TotalValue.ToString("#.###").Length))$ValueSuffix / $($TotalValue.ToString("#.###"))$ValueSuffix ] $($percentComplete.ToString("##0.00").PadLeft(6)) % complete"
                }
                else {
                    Write-Host -NoNewLine "`r$ProgressText $progbar [ $($TotalValue.ToString("#.###").PadLeft($TotalValue.ToString("#.###").Length))$ValueSuffix / $($TotalValue.ToString("#.###"))$ValueSuffix ] $($percentComplete.ToString("##0.00").PadLeft(6)) % complete"                    
                }                
            }   
        }
    }
    Process {
        try {
            $storeEAP = $ErrorActionPreference
            $ErrorActionPreference = 'Stop'
        
            # invoke request
            $request = [System.Net.HttpWebRequest]::Create($URL)
            $response = $request.GetResponse()
  
            if ($response.StatusCode -eq 401 -or $response.StatusCode -eq 403 -or $response.StatusCode -eq 404) {
                throw "Remote file either doesn't exist, is unauthorized, or is forbidden for '$URL'."
            }
  
            if($OutFile -match '^\.\\') {
                $OutFile = Join-Path (Get-Location -PSProvider "FileSystem") ($OutFile -Split '^\.')[1]
            }
            
            if($OutFile -and !(Split-Path $OutFile)) {
                $OutFile = Join-Path (Get-Location -PSProvider "FileSystem") $OutFile
            }

            if ($OutFile) {
                $fileDirectory = $([System.IO.Path]::GetDirectoryName($OutFile))
                if (!(Test-Path($fileDirectory))) {
                    [System.IO.Directory]::CreateDirectory($fileDirectory) | Out-Null
                }
                if ((Test-Path($OutFile)) -And $SkipIfExist -eq $true) {
                    Return
                }
            }

            [long]$fullSize = $response.ContentLength
            $fullSizeMB = $fullSize / 1024 / 1024
  
            # define buffer
            [byte[]]$buffer = new-object byte[] 1048576
            [long]$total = [long]$count = 0
  
            # create reader / writer
            $reader = $response.GetResponseStream()
            $writer = new-object System.IO.FileStream $OutFile, "Create"
  
            # start download
            $finalBarCount = 0 #show final bar only one time
            do {
          
                $count = $reader.Read($buffer, 0, $buffer.Length)
          
                $writer.Write($buffer, 0, $count)
              
                $total += $count
                $totalMB = $total / 1024 / 1024
          
                if ($fullSize -gt 0) {
                    Show-Progress -TotalValue $fullSizeMB -CurrentValue $totalMB -ProgressText "Downloading $($OutFile.Name)" -ValueSuffix "MB"
                }

                if ($total -eq $fullSize -and $count -eq 0 -and $finalBarCount -eq 0) {
                    Show-Progress -TotalValue $fullSizeMB -CurrentValue $totalMB -ProgressText "Downloading $($OutFile.Name)" -ValueSuffix "MB" -Complete
                    $finalBarCount++
                    #Write-Host "$finalBarCount"
                }

            } while ($count -gt 0)
        }
  
        catch {
        
            $ExeptionMsg = $_.Exception.Message
            Write-Host "Download breaks with error : $ExeptionMsg"
        }
  
        finally {
            # cleanup
            if ($reader) { $reader.Close() }
            if ($writer) { $writer.Flush(); $writer.Close() }

            $ErrorActionPreference = $storeEAP
            [GC]::Collect()
        }    
    }
}