i try getting maps by downloading it on tremulous. Its never even starts downloading. I dunno what the problem is but i can't get any more maps.
Get the tjw client from trem.tjw.org. Then enable www downloading with cl_allowdownload 1.
... or you can download them yourself. The list of all maps (http://tremulous.net/forum/index.php?topic=3574.0)
might be a good place to start. Or visit MG's map repository
here (http://downloads.mercenariesguild.net/maps/)
Place the .pk3 files in the 'base' subdirectory of your tremulous directory.
Do not unzip the pk3 files!
Make sure your web browser does not treat the .PK3 files as .ZIP archives!