Lo and behold the power of the terminal, as it'll start downloading everything for you. Note that if you'll need to stop the downloading, copy/pasting the same command again will work - it'll skip over the already downloaded files.cd ~/.spring/maps
wget -c -np -nd -A sd7,sdz -r http://evolutionrts.info/maps
Have fun!
Edited: Thanks to bibim and lurker for providing a much shorter version!