Welcome!
If you are looking for some serious game play I think you will like it here.
There is a bunch of real expert players around here regularily.
L4D1 is mostly overrun by russians^^
But I like to keep the servers especially because of the good old r0r mod.
oddis runs an FTP with custom maps.
He posted the address
[You must be registered and logged in to see this link.]I don't know if all maps are there and if they are the latest versions.
But for some of the older maps you could get a quicker download I think.
The zip file names contain the date so it should be easy to check their version.
I don't plan to offer downloads in any way because I don't want to waste any game server bandwidth.
I know it would be easier for others to have a quick and easy download.
I have a free account on l4dmaps and for me the downloads are quite fast.
If anybody else wants to host custom maps (on FTP or torrent or MEGA or whereever) they are free to post the links here for forum members.