One the upper left in Google Code it has a link "Checkout"
Click that and you will get a command line suggestion:
Command-line access
Use this command to anonymously check out the latest project source code:
Non-members may check out a read-only working copy anonymously over HTTP.
svn checkout http://yourfolder.googlecode.com/svn/trunk/ yourfolder-read-only
If you want a subfolder only then add it after trunk
If you are on linux & have SVN installed just CD to the folder where you want it installed first then run the above command - it will download fast
I tried all the other suggestions & this is the only thing that worked, couldnt do it with bazaar or svnDownloader app.