3.25.4 Message Processing Events and Sequencing Rules

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To retrieve an IUpdateDownloadContent instance, a client MUST call IUpdateDownloadContentCollection::Item (opnum 8) (section 3.26.4.1).

To retrieve an IUpdateDownloadContent2 instance, a client MUST retrieve an IUpdateDownloadContent instance, and then use the IUnknown::QueryInterface method to obtain an IUpdateDownloadContent2  instance.