Help converting Macro to be compatible with Mac

Hello! I have a client that is using Macs to run the macro below and I am having trouble converting it. At solutions?

SubMergeExcelFiles()
Dim fnameList, fnameCurFile As Variant
Dim countFiles, countSheets As Integer
Dim wksCurSheet As Worksheet
Dim wbkCurBook, wbkSrcBook As Workbook

fnameList =Application.GetOpenFilename(FileFilter:="Microsoft Excel Workbooks(*.xls;*.xlsx;*.xlsm),*.xls;*.xlsx;*.xlsm", Title:="Choose Excelfiles to merge", MultiSelect:=True)

If (vbBoolean <> VarType(fnameList)) Then

If (UBound(fnameList) > 0) Then
countFiles =0
countSheets= 0

Application.ScreenUpdating = False
Application.Calculation = xlCalculationManual

SetwbkCurBook = ActiveWorkbook

For EachfnameCurFile In fnameList
countFiles = countFiles + 1

Set wbkSrcBook = Workbooks.Open(Filename:=fnameCurFile)

For Each wksCurSheet In wbkSrcBook.Sheets
countSheets = countSheets + 1
wksCurSheet.Copy after:=wbkCurBook.Sheets(wbkCurBook.Sheets.Count)
Next

wbkSrcBook.Close SaveChanges:=False

Next

Application.ScreenUpdating = True
Application.Calculation = xlCalculationAutomatic

MsgBox"Processed " & countFiles & " files" & vbCrLf& "Merged " & countSheets & " worksheets",Title:="Merge Excel files"
End If

Else
MsgBox "No filesselected", Title:="Merge Excel files"
End If
End Sub