Workbook AddinInstall Event

Syntax
Private Sub Workbook_AddinInstall()
Enter Code
End Sub

This event will run when the specific workbook is installed as Add-In in Excel.

Example
Private Sub Workbook_AddinInstall()
Dim MyForm As Object

Set MyForm = ActiveWorkbook.VBProject.VBComponents.Add(vbext_ct_MSForm)

    'Create the User Form
    With MyForm
        .Properties("Caption") = "My Form"
        .Properties("Width") = 450
        .Properties("Height") = 300
    End With
End Sub

Result
This example will create a new user form to whatever workbook is active when the workbook is installed as Add-In in Excel. It will also assign the new form caption, width and height values.