Download complete projects from Google Docs- follow these steps

You can download all those files from Google Docs.You need to follow
these steps:

1) Open it in Google Chrome (Tested)
2)select all those folders u want to download
3) go to option "more"
4) select "download"
5)its will automatically zip all those folders and will b downloaded
in the form of ZIP folder(all in one)

note: in this way you can select all the folders of one project and
download at one go...
You can get complete project in one ZIP folder.