benmarty wrote: I'm not seeing the multi-instance tab in the project settings. I can't find any other way to enable multi-instance installation. What am I missing? With the "Releases" page selected (under "Media" in the Installation Designer), select a configuration node directly under the root "Releases" node in the tree. Notice that there are multiple tabs in the right-hand pane, one of them being "Multiple Instances". I totally missed the fact that there are tabs in the rightmost pane sometimes, and so I was missing a *lot* of options here! 😮 ... View more

Finally worked through the rest of the issue, I think. I added the custom action for loading the existing IS_SQLSERVER_SVCINSTANCE and related properties to the Install UI Sequence after ValidateProductID with the condition REMOVE <> "ALL", and added it to the Install Exec Sequence after ValidateProductID with the condition REMOVE = "ALL". ... View more

I worked out that I can use code like this in a VBScript custom action to re-establish the values of my properties on subsequent runs of the installer (works great when running a new install on a system where the service is already installed): Dim regIndex regIndex = -1 Do Dim name name = Session.Installer.RegistryValue(2, "SYSTEM\CurrentControlSet\services", regIndex) If IsNull(name) Then Exit Do If IsEmpty(name) Then Exit Do If Len(name) = 0 Then Exit Do If Len(name) >= 9 And Left(name, 9) = "MyService" Then Dim instance instance = Mid(name, 10) Session.Property("IS_SQLSERVER_SVCINSTANCE") = instance If Len(instance) > 0 Then instance = Mid(instance, 2) End If Session.Property("IS_SQLSERVER_INSTANCE") = instance If Len(instance) > 0 Then Session.Property("IS_SQLSERVER_SQLDEP") = "MSSQL$" & instance Session.Property("IS_SQLSERVER_INSTANCETITLE") = " (" & instance & ")" Session.Property("IS_SQLSERVER_SERVER") = "(local)\" & instance Else Session.Property("IS_SQLSERVER_SQLDEP") = "MSSQLSERVER" End If Exit Do End If regIndex = regIndex - 1 Loop So I set that custom action to run after ValidateProductID. But I still don't seem to be getting the service un-installed. Do custom actions run during an un-install? I only specified it for the "Install UI Sequence", not the "Install Exec Sequence" or any of the others, but I don't see an "Uninstall Sequence". Do I need to add it to one of these other sequences? ... View more