I Found the error it needed to have ,editable = true after the path to open the template! 
Sub ReNameFile()
Const wsINV As String = "Imput Sheet"
Dim newFile As String, fName As String
Dim wbook As Workbook
'Dim ClientName As String
Dim Today As Date
'Dim strFilename As String
'Dim strFolder As String
Dim NewVal As Long
Dim Template As String
Dim dt As String, wbNam As String, FileName As String
With Sheets(wsINV)
If Range("AA1") = "" Then 'the doublecheck cell
Application.ScreenUpdating = False
Application.EnableEvents = False
Application.DisplayAlerts = False
'Template = "C:\Users\Mick\Documents\Custom Office Templates\New Estimate Template.xltm" 'reopen the template
Workbooks.Open FileName:="C:\Users\Mick\Documents\Custom Office Templates\New Estimate Template.xltm", Editable:=True
'Activate Workbook
'Workbooks.Activate Template
With ActiveWorkbook.Sheets(wsINV) 'update the template's current inv number
.Range("J2").Value = .Range("J2").Value + 1
NewVal = .Range("J2").Value 'remember the new number
End With
ActiveWorkbook.Close True
'ActiveWorkbook.Close False 'close the template, save changes
Application.ScreenUpdating = True
Application.EnableEvents = True
End If
End With
With Sheets("Imput Sheet")
Range("J2").Value = NewVal 'put new number into current workbook
Range("AA1") = "Incremented" 'flag the doublecheck cell
If .Range("C3") = "" Then _
.Range("C3").Value = InputBox("Please enter a client name")
If .Range("J4") = "" Then _
.Range("J4").Value = Date
End With
wbNam = Range("A24")
dt = Format(CStr(Now), "dd_mm_yy")
ChDir _
"C:\Users\Mick\Dropbox\SPSL Shared\Estimates 2015\"
ActiveWorkbook.SaveAs FileName:="Estimate" & " " & wbNam & " " & dt, FileFormat:=(52)
End Sub
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