I've tried to get around the file size limit but to no avail.
Instead I've added SHA256, SHA384 en SHA512 functions :P
 Code:
Function SHA256($strFileName)
  Dim $objXML, $objXEL, $objSHA256, $objStream, $BinaryFile
  $objStream = CreateObject("ADODB.Stream")
  $objStream.Type = 1
  $objStream.Open
  $objStream.LoadFromFile($strFileName)
  $BinaryFile = $objStream.Read
  $objStream.Close
  $objStream = ""
  $objSHA256 = CreateObject("System.Security.Cryptography.SHA256Managed")
  $=$objSHA256.ComputeHash_2($BinaryFile)
  $objXML = CreateObject("MSXML2.DOMDocument")
  $objXEL = $objXML.CreateElement("tmp")
  $objXEL.DataType = "bin.hex"
  $objXEL.NodeTypedValue = $objSHA256.Hash
  $SHA256 = $objXEL.Text
EndFunction

? "SHA256: "+SHA256("D:\Firefox Setup 46.0.1.exe")

 Code:
Function SHA384($strFileName)
  Dim $objXML, $objXEL, $objSHA384, $objStream, $BinaryFile
  $objStream = CreateObject("ADODB.Stream")
  $objStream.Type = 1
  $objStream.Open
  $objStream.LoadFromFile($strFileName)
  $BinaryFile = $objStream.Read
  $objStream.Close
  $objStream = ""
  $objSHA384 = CreateObject("System.Security.Cryptography.SHA384Managed")
  $=$objSHA384.ComputeHash_2($BinaryFile)
  $objXML = CreateObject("MSXML2.DOMDocument")
  $objXEL = $objXML.CreateElement("tmp")
  $objXEL.DataType = "bin.hex"
  $objXEL.NodeTypedValue = $objSHA384.Hash
  $SHA384 = $objXEL.Text
EndFunction

? "SHA384: "+SHA384("D:\Firefox Setup 46.0.1.exe")

 Code:
Function SHA512($strFileName)
  Dim $objXML, $objXEL, $objSHA512, $objStream, $BinaryFile
  $objStream = CreateObject("ADODB.Stream")
  $objStream.Type = 1
  $objStream.Open
  $objStream.LoadFromFile($strFileName)
  $BinaryFile = $objStream.Read
  $objStream.Close
  $objStream = ""
  $objSHA512 = CreateObject("System.Security.Cryptography.SHA512Managed")
  $=$objSHA512.ComputeHash_2($BinaryFile)
  $objXML = CreateObject("MSXML2.DOMDocument")
  $objXEL = $objXML.CreateElement("tmp")
  $objXEL.DataType = "bin.hex"
  $objXEL.NodeTypedValue = $objSHA512.Hash
  $SHA512 = $objXEL.Text
EndFunction

? "SHA512: "+SHA512("D:\Firefox Setup 46.0.1.exe")