Another option, this is what I do.
Key points.
Addin version is "some number", file name is always the same.
Installation directory must be known
When asked, the current addin, looks to see if a new version is available. I do this via a system that has a version number in the file name of the "update" and a version number as a const in the code.
Having established I we can update, I go and get the update "package" - in my case I am using an installer and a small vb.net app. If you cant do this then you might want to spin up an insatnce of PPT or word, and use that complete the install.
Next close yourself, or ask the user to close Excel.
Now all we need to do is save the new addin over the old one, with the same file name.
Tell the user its updated, and they should re-open Excel, close the install program.
This works well for me - although you need to remember the numbering system , in the file name and how that code works.
The below is the main guts of the code bit messy, but might help you out.
Private Sub CommandButton1_Click()
Dim RetVal As Long
MsgBox "To install the update, follow the installer programes directions." & vbNewLine & vbNewLine & _
"You will need to then closed down and restart Excel.", vbInformation + vbOKOnly, "::::UPDATE TRS:::::"
RetVal = Shell(gsDataBase1 & "\" & gsUpdatefolder & "\" & GetUpdateFileName(), 1)
ThisWorkbook.Close
Unload Me
End Sub
Private Sub CommandButton2_Click()
gbInUpdate = False
Unload Me
End Sub
Private Sub UserForm_Initialize()
Me.lbNew = GetServerVersion2
Me.lbCurrent.Caption = gcVersionNumber
'CheckVersionNumbers
End Sub
'''This method might be better, but is quite slow.
Public Sub GetServerVersion()
Set objshell = CreateObject("Shell.Application")
Set objFolder = objshell.Namespace(gsDataBase1 & "\" & gsUpdatefolder)
For Each strFileName In objFolder.Items
Me.lbNew.Caption = objFolder.GetDetailsOf(strFileName, 11)
Next
Set objshell = Nothing
End Sub
Public Function IsNewer() As Boolean
Dim curVer As Long
Dim newVer As Long
On Error GoTo Catch
curVer = CLng(Left(Replace(Me.lbCurrent, ".", ""), 2))
newVer = CLng(Left(Replace(Me.lbNew, ".", ""), 2))
If curVer < newVer Then
IsNewer = True
Else
IsNewer = False
End If
Exit Function
Catch:
IsNewer = False
End Function
Private Function GetServerVersion2() As String
On Error GoTo LEH
Dim strDocPath As String
Dim strCurrentFile As String
strDocPath = gsDataBase1 & "\" & gsUpdatefolder & "\"
strCurrentFile = Dir(strDocPath & "*.*")
'gets last file - randomly? should onl;y be one anyway!
'Do While strCurrentFile <> ""
GetServerVersion2 = Right(strCurrentFile, 11)
GetServerVersion2 = Left(GetServerVersion2, 7)
'Loop
Exit Function
LEH:
GetServerVersion2 = "0.Error"
End Function
'Basiclly a coop of GetSeverVerion, but just get the file name so the exe can be called by the shell operation under the update button
''seems clumbys, but works!
Private Function GetUpdateFileName() As String
On Error GoTo LEH
Dim strDocPath As String
Dim strCurrentFile As String
strDocPath = gsDataBase1 & "\" & gsUpdatefolder & "\"
GetUpdateFileName = Dir(strDocPath & "*.*")
Exit Function
LEH:
GetUpdateFileName = "0.Error"
End Function