Hi,

I want to prevent users double-clicking to load my add-in. I would like a
warning to appear telling them how to install it properly.

I can detect whether Workbook_AddinInstall() has executed (code below),
which is great EXCEPT:
When the user opens excel with the add-in already installed, it does not
execute again, and my warning comes up.

Any ideas?

Thanks
Rich

Option Explicit
Dim AddInLoad As Boolean

Private Sub Workbook_AddinInstall()
AddInLoad = True
End Sub

Private Sub Workbook_Open()
If AddInLoad Then
If ThisWorkbook.IsAddin Then
MsgBox "add In - all cool"
Else
MsgBox "Not really sure if this is possible"
End If
Else
If ThisWorkbook.IsAddin Then
MsgBox "addin loaded badly, warning and exit"
Else
MsgBox "Spreadsheet only"
End If
End If
End Sub