Update excel file when opened if a new version is available - vba

Question

I have an Excel file which checks its local version with the current version from a database. The code to check the version isn't important to the question.
If there's a new version I want to download it, close the old file (because I can't change/modify it while opened), replace it with the new downloaded version and open the downloaded version.
What I have is something like this:
file.xlsm
Private Sub Workbook_Open()
Workbooks.Open ThisWorkbook.Path & "\update.xlsm"
End Sub
update.xlsm
Private Sub Workbook_Open()
Workbooks("file.xlsm").Close
Dim num As Byte
Dim WHTTP As Object
On Error Resume Next
Set WHTTP = CreateObject("WinHTTPrequest.5")
If Err.Number <> 0 Then Set WHTTP = CreateObject("WinHTTPrequest.5.1")
On Error GoTo 0
WHTTP.Open "GET", "http://path/file.xlsm", False
WHTTP.Send
num = FreeFile
On Error Resume Next
Open ThisWorkbook.Path & "\file.xlsm" For Binary Access Write As num
If Err.Number <> 0 Then
Workbooks(ThisWorkbook.Path & "\file.xlsm").Close
Open ThisWorkbook.Path & "\File.xlsm" For Binary Access Write As num
End If
On Error GoTo 0
Put num, , WHTTP.ResponseBody
Close num
Workbooks.Open ThisWorkbook.Path & "\file.xlsm"
ThisWorkbook.Close
End Sub
The issue is that since update.xlsm was opened from file.xlsm, once I close file.xlsm, the code from update.xlsm stops running.
I found this thread which is pretty much what I want to do but I couldn't figure out how to get the Application.OnTime working.
Here's where I got the code to download the file.
Edit:
Ok, so I got it almost fully working with the following:
server file.xlsm
Private Sub Workbook_Open()
'Workbooks.Open ThisWorkbook.Path & "\update.xlsm"
End Sub
local file.xlsm
Private Sub Workbook_Open()
Workbooks.Open ThisWorkbook.Path & "\update.xlsm"
End Sub
local update.xlsm
ThisWorkbook:
Private Sub Workbook_Open()
Application.OnTime Now, "test"
End Sub
Module:
Sub test()
Workbooks("file.xlsm").Close
Dim num As Byte
Dim WHTTP As Object
On Error Resume Next
Set WHTTP = CreateObject("WinHTTPrequest.5")
If Err.Number <> 0 Then Set WHTTP = CreateObject("WinHTTPrequest.5.1")
On Error GoTo 0
WHTTP.Open "GET", "http://path/file.xlsm", False
WHTTP.Send
num = FreeFile
On Error Resume Next
Open ThisWorkbook.Path & "\file.xlsm" For Binary Access Write As num
If Err.Number <> 0 Then
Workbooks(ThisWorkbook.Path & "\file.xlsm").Close
Open ThisWorkbook.Path & "\File.xlsm" For Binary Access Write As num
End If
On Error GoTo 0
Put num, , WHTTP.ResponseBody
Close num
Workbooks.Open ThisWorkbook.Path & "\file.xlsm"
If Workbooks.Count = 1 Then
Application.Quit
Else
ThisWorkbook.Close
End If
End Sub
The problem I'm getting now is the new downloaded file from the server gets corrupted in some way (it works after the message of Excel repairing the file).

Answer 1

Split the Macro in 2 parts, and use OnTime to trigger the second part first. Here is an example:
Option Explicit
Private Sub Workbook_Open()
On Error GoTo SkipErr
Application.OnTime Now(), "ThisWorkbook.Part2" 'Run as soon other macros finish
Workbooks("file.xlsm").Close
SkipErr:
MsgBox "file.xlsm was not open...", vbCritical
End Sub
Public Sub Part2()
MsgBox "This message will show!", vbInformation
End Sub