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Viewing post in Jessie (Pokémon)—Pokémon Transfer Pregnancy Expansion comments
You click on the download button and it should give you prompts on how to download it to your PC. If you're on mobile, I'm not sure how downloading a HTML5 file would work, though.
If you mean the Deluxe stuff, once you've paid $2 you should get a link or a download page with all the files available.