You could save this macro in your personal workbook and run it for each workbook
Sub Macro1()
For Each ws In ActiveWorkbook.Sheets
ws.Activate
Columns("D:D").Select
Selection.Copy
Range("E1").Select
Selection.PasteSpecial Paste:=xlPasteValues, Operation:=xlNone, SkipBlanks _
:=False, Transpose:=False
Application.CutCopyMode = False
Next ws
End Sub