FYI, for those who come along later, the OP is currently investigating simply using Gumroad for a 5-part download (or more parts). If you ever buy packages on sites like MightyDeals, Creative Market, etc., it's commonplace for them to provide mulitple links for a single "product" download, so after some discussion, this seems like the best way forward for him.
I've asked him to update here in the future when he knows more.
Hitch
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