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What would cause a installer package, an executable, and in this case a .MSI file, to be downloaded as a PDF document?
Nothing related to Acrobat. File transfers are happening outside from the application and are controlled by the operating system and bweb browser you're using.
What extension does you see at the file?
Are you sure it's not a PDF file? What do you see when you open it in Acrobat? Or using a plain-text editor, like Notepad?