
Just go and download Tortoise SVN: http://tortoisesvn.net/downloads
Tortoise will ask you to restart your computer. Once you have done that simply browse in windows explorer to your "my documents/my games/spring/Mods" folder and create a new folder called "evolutiondev.sdd".
Right click on the "evolutiondev.sdd" folder, Tortoise SVN > Checkout
The URL to plug in is: http://svn.evolutionrts.info/evolutiondev.sdd/
Once you've done that, you're all set. To update your local copy of the files, just right click on the evolution.sdd folder, Svn Update.
To view revision history and the repository, just go to: http://redmine.evolutionrts.info