If you want to install additional redistributable applications with your application, you can add them to the setting using the usual [Files] entry with the dontcopy flag.
You can then retrieve it during the PrepareToInstall event PrepareToInstall with the ExtractTemporaryFile() function and run it with Exec() .
This method will also allow you to check the exit code and the restart request, if necessary.
The ISXKB wiki has various related articles .
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