AHK: Прогресс загрузки файла

Url            = https://www.autohotkey.com/download/ahk-install.exe
	DownloadAs     = ahk.exe
	Overwrite      := True 
	UseProgressBar := True
	DownloadFile(Url, DownloadAs, Overwrite, UseProgressBar)
	

;=================== Start Functions =====================================================================

DownloadFile(UrlToFile, SaveFileAs, Overwrite := True, UseProgressBar := True) {
    ;Check if the file already exists and if we must not overwrite it
      If (!Overwrite && FileExist(SaveFileAs))
          Return
    ;Check if the user wants a progressbar
      If (UseProgressBar) {
          ;Initialize the WinHttpRequest Object
            WebRequest := ComObjCreate("WinHttp.WinHttpRequest.5.1")
          ;Download the headers
            WebRequest.Open("HEAD", UrlToFile)
            WebRequest.Send()
          ;Store the header which holds the file size in a variable:
            FinalSize := WebRequest.GetResponseHeader("Content-Length")
          ;Create the progressbar and the timer
            Progress, H80, , Downloading..., %UrlToFile%
            SetTimer, __UpdateProgressBar, 100
      }
    ;Download the file
      UrlDownloadToFile, %UrlToFile%, %SaveFileAs%
    ;Remove the timer and the progressbar because the download has finished
      If (UseProgressBar) {
          Progress, Off
          SetTimer, __UpdateProgressBar, Off
      }
    Return
    
    ;The label that updates the progressbar
      __UpdateProgressBar:
          ;Get the current filesize and tick
            CurrentSize := FileOpen(SaveFileAs, "r").Length ;FileGetSize wouldn't return reliable results
            CurrentSizeTick := A_TickCount
          ;Calculate the downloadspeed
            Speed := Round((CurrentSize/1024-LastSize/1024)/((CurrentSizeTick-LastSizeTick)/1000)) . " Kb/s"
          ;Save the current filesize and tick for the next time
            LastSizeTick := CurrentSizeTick
            LastSize := FileOpen(SaveFileAs, "r").Length
          ;Calculate percent done
            PercentDone := Round(CurrentSize/FinalSize*100)
          ;Update the ProgressBar
            Progress, %PercentDone%, %PercentDone%`% Done, Downloading...  (%Speed%), Downloading %SaveFileAs% (%PercentDone%`%)
      Return
}