"respective" means basically "the files from folder "xyz" on your PC go into the "xyz" folder in your Zen Cart folder" ...
That is, "respective" suggests matching names/structures.
So, since Zen Cart has folders like this:
/admin/
/admin/includes/
/admin/includes/languages/
/images
/includes/
/includes/classes/
/includes/languages/
/includes/templates/
... etc
Then since your zip file ALSO includes folders of similar names/structures/subfolders, you would put files from matching folders in their corresponding matching/respective/same-name/whatever-you-wanna-describe-it-as folders of your Zen Cart folder.
ie: files IN your zip file's /admin/ folder would go IN your Zen Cart /admin/ folder. Don't copy the /admin/ folder into another /admin/ folder, because that would create a new /admin/admin/ folder which would not work.
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