Don't delete components from an MSI

In an MSI, don't ever delete a component unless you plan to make it a"major upgrade" (change of both product and package GUIDs) rather thanjust a "minor upgrade" (same product GUID, different package GUID). If you try, msiexec will fail with "another version of this product is already installed". It was particularly frustrating for me because I use InstallShield to build an MSI wrapped inside InstallScript, and InstallShield was silently suppressing the error and just notinstalling anything.

To achieve the same effect as deleting the component, I just deleted all the files within that component instead, and that worked fine.