Origin,
I will give you a brief how-to, and some links to other info on how to use this.
First, there is a lot if info on my website on the different parameters and how things work:
http://www.muddydogpaws.com/notebook/file-download-snippet
Second, I wrote a styling tutorial here:
http://modxcms.com/forums/index.php/topic,3124.msg30554.html#msg30554
So a quick tutorial:
1. Install the snippet
2. create a document where you want to display a list of files.
3. Setup a folder on your server where you have files for download. (for this example we will use assets/files)
4. Insert the snippet call like the following:
[!FileDownload?getFolder=`assets/files`!]
5. Thats all you need to do.
If you want it to look different review the style post I have above. There are also many other parameters you can use and they are detailed included readme and on my website.
Kyle