Or by bringing them up on the Whale server 188.8.131.52 by typing ex: vote map xalley
Also if you have the mod there's a quick trick to downloading the maps with all textures & resources:
since the mod has http downloading enabled there's a straightforward work around to getting them. All you need to do is download just the .bsp / .bsp.override files manually and run the mod using the provided server_wodx.cfg. It'll then fetch all the missing textures, models and sounds from our main server when you change to that given map or override in console. It uses HTTP so it's just as fast as downloading from any website.
Note: Server side overrides are only supported by r1q2, but you'll still be able to connect to the server with any client such as Q2 Pro to be able to view replacement models and entities with much better rendering.