I see in Galaxy that the Enhanced Edition is only downloadable (offline backup installers) as 19 individual downloads. Why is this not a single "click" (as other games with multiple files)?

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Actually I believe both posters provided a solution but I can only pick one. I had hoped I'd be able to combine the posts for the answer. Thank you to both posters.
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This is because they've added the Enhanced Edition downloads to the patches section. It seems that they can't add two different versions of a game to the game installer section. I guess this is just a limitation in GOG's system. xD