The whole paradigm sort of assumes a single installation instance - centering around the component rules and their reference counting based on a single, absolute installation path as explained in this answer. Multiple MSI Installation Instances: Windows Installer is sort of ill-equipped to handle installation of the same product multiple times. Upgrade Code: identifies a family of related products.Product Code: identifies a product version.Package Code: identifies a specific MSI file.In such cases they generally share the same upgrade code - which is a code that identifies a family of related products. This is indeed possible, and can indicate different versions of the same product (different version, different language, different edition, etc.). Perhaps you are referring to different product codes. If two MSI files have the same package code they are by definition the same file as far as Windows Installer is concerned - very strange problems can result - if the files are indeed different (and not just copies of the same file). A package code is a unique identifier for an MSI file. " I want to install multiple instances of a software. Package Code: A package code must be unique per MSI file.
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