Nick Hennemann wrote:

    * Create the RTM version of my installer
    * Be able to patch the RTM version with any patch that I create for it
    * Also be able to patch the RTM version that has already been
      patched with a previous (earlier) patch


The MSI patching model supports that but as you found, it quickly turns into a exponential nightmare both for building the patches and applying them. The general approach is to support multiple QFE patches but cumulative minor upgrade patches (aka service packs). The service packs supercede the QFEs and eventually become the required target images. It keeps the matrix down to a manageable level.

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