Deus Ex Multiplayer has very nice plus - we all can create easily maps and mods and play (of course, if we have skills) on them with other players. And also there are more then 250 maps already created for DXMP. I think, most of people has downloaded at least 1 map from the server, some people prefer downloading only from the server because they're too lazy to visit the map archive/creators site (except clever dial-up'pers and people, who has limited traffic connection, like me

If you know exactly that people can download map you're using by any other ways (instead of downloading it from your server), you can disallow your server sending the map.
How to disallow downloading (if in another words, disallow server to send the map)? Most of newbie hosters think that only thing they need to do is setting bAllowDownloads=False in the preferences. But this disallows your client (Deus Ex i mean) to download maps from servers, but not servers to send maps. To disallow servers sending maps you will need to do the following things by steps.
If quickly: we're going to change the hex code of the map to disallow it's downloading (it's working and i checked this many times).
1) We need to get a hex editor. I use Ultra Edit 32 and i think, it is the best. Here is the link: ftp://ultraedit.com/uedit32.zip - file size is about 2.6 mb. You will need to register the programm after 45 days of use. If you want to pay 30 $ - this is up to you, but russians never pay

If you want German or French versions of the editor, check the site: http://www.ultraedit.com
Also, by the way, this program is useful for many things, it helped me many times in creating my sites. It is working like notepad, BUT it can open big files only in few seconds while Microsoft Notepad crushes. Read more about the program on its site.
2) Install Ultra Edit 32. Launch it.
3) Click File > Open. Go to your DeusEx/Maps directory, for example, C:/ProgramFiles/DeusEx/Maps. I think, we need no more descriptions, this is easy. Open map you want to disallow downloading from your server (for example, Funline_UnlimitedParty-1)
4) Make sure you're in HEX editing mode. If you're in HEX editing mode, you will see LOTS of numbers like '01 00 00 01 45' and etc, if you're not in HEX mode, you will see plain text with unknown symbols. To switch to HEX mode you will need to press Ctrl + H OR click menu Edit > Hex Edit.
5) Find first line in this map HEX code. It always starts from C1 83 2A and etc. Find 9-th pair of numbers. It is set to 01. You need to change it to 00. Watch more on these screenshots.
This is what you see and what you need to change:

Already changed HEX pair:

This is easy, just change 1 to 0 in that pair.