I have 2 msi files that I run silently one after the other from win forms application (master installer for that matter). Both of them configured to write to registry to same location, for example:
HKLM\Software\MyProduct\MSI1
HKLM\Software\MyProduct\MSI2
Now, I run uninstall in reverse order and when uninstall done, MSI1 removed from registry, but MSI2 is stuck there... Is there anything can be done about that without custom action or coding?
This happens because your registry entries use the same component as another product installed on the machine. For example, you copied the setup project of an existing product and used the copy to create an MSI for a different product.
To avoid it, you need to make sure that each MSI uses unique component names and GUIDs. It's not easy in Visual Studio setup projects. You can try editing the project file. If it doesn't work, it's better to start from scratch with a new setup project.