Summary

Symptoms

Project Type: Basic MSI and Installscript MSI

You may see a prompt for source (i.e. "Please insert Disk1...") when performing a Minor Upgrade when you are upgrading with a CD image where the installer resides on a subfolder of the removable media.

Cause

This is due to the way Windows Installer handles its lists of registered sources. It will only be aware of the subfolder if the original version was installed from the same subfolder of the removable media.

Workaround

One way of getting around this issue is to use some script to specify the MediaPackagePath value that includes the subfolder name. Below is an example of how this looks in VBScript:

--

Set objInstaller = CreateObject("WindowsInstaller.Installer").Product("{44F1EE72-5A62-475B-8A56-E1094A8EACB4}","",4)

objInstaller.SourceListInfo("MediaPackagePath") = "\Thingy\"
Set objInstaller = nothing

--

Note that in this example, the Product Code is explicitly defined. This will need to match your own ProductCode in order to work. Generally, it's been observed that this works more reliably than setting the MEDIAPACKAGEPATH property via commandline:

MEDIAPACKAGEPATH Property (Windows)