* https://github.com/abo-abo/org-download/blob/master/org-download.el has:

...
(defcustom org-download-backend t
  "Method to use for downloading."
  :type '(choice
          (const :tag "wget" "wget \"%s\" -O \"%s\"")
          (const :tag "curl" "curl \"%s\" -o \"%s\"")
          (const :tag "url-retrieve" t))
  :group 'org-download)
...

** My guess: You don't have "wget" and/or "curl" on your Mac?


On Tue, Jan 13, 2015 at 2:49 AM, Chao Lu <loochao.list@gmail.com> wrote:

> Dear all,
>
> Does anyone get org-download.el to work under Mac OSX? I'm struggling to
> get it work, but it seems to help a lot, empowering org to handle images a
> lot easier.
>
> I believe I've installed org-download.el correctly, but when I'm dragging
> and drop the image into an org buffer, all I get is the link address
> inserted into the buffer, no downloading events trigger.
>
> I double checked a few things before coming here:
> - My system has both curl and download.
> - I've set the download image dir to ~/Downloads/Foo
> - The value of dnd-protocol-alist contains
> ("^\\(https?\\|ftp\\|file\\|nfs\\)://" . org-download-dnd)
>
> The emacs I'm using is "GNU Emacs 24.3.1 (x86_64-apple-darwin, NS
> apple-appkit-1038.36) of 2013-03-13 on bob.porkrind.org"
>
> Is there any thought what I should check?
>
> Best,
>
> Chao
>