Go to the source tab of your projects page. There you will find a svn checkout URL of the project and the username. My URL looked like following
https://ceyloan-wordpress-theme.googlecode.com/svn/trunk/
In the same page, you will find a link to googlecode.com password. , follow this link to get the password.
Install TortiseSVN
Right click on the folder containing the source files. Click on TortiseSVN > Import
Enter the trunk URL, you will be prompted to enter the username and password.
That’s about it!
