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Do I understand it correctly therefore that one should copy the admin folder to a folder named cart in the root on the server?

Hence where the pdf says:

'Upload the entire “admin” folder content from your computer into the “cart” folder."

one could/should read it as:

"Upload the entire “admin” folder............ from your computer into the “cart” folder."

or

"Upload the ............ “admin” folder [with all of its] content from your computer into the “cart” folder."

As I mentioned, you should respect the original file structure. I though that this would be clear, if you read the entire paragraph Step 5.

I'm sorry if it isn't clear enough or Leaves space to interpretations.