[std.net.curl] Downloading multiple files using download()

[Jack via Digitalmars-d-learn]

I'm trying to create a sort of "downloader" where it will 
download multiple pages of "comics" which are in ".jpg" format. 
Now the problem is, that when I used the "download() function":
>download(url, location);
Where:
url = direct link to the image
location = "/downloads/" ~ to!string(x) ~ ".jpg"; (x is the page 
number)

It would spew out an error code:
> std.stream.OpenException at std/stream.d(50): Cannot open or 
> create file >'/downloads/1.jpg'

I dug around to see that nothing but the documentation page has 
an example for this, but unfortunately it was only for one file.

So can anyone help me?

Note: I can't get the url here since the url is a little bit 
"NSFW"