ISSetup.dll is a C++ MSI DLL that contains the full InstallScript scripting run-time engine. For InstallScript MSI, Basic MSI, and merge module installations, ISSetup.dll executes InstallScript custom actions. For InstallScript projects, ISSetup.dll must be in the Disk1 folder.
Your installation always uses the InstallScript scripting run-time engine with which it was built, even if more a more recent version is installed on a target machine by another installation.
Note the following information:
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