Here is Discband 4.
If you have a windows pc and don't already have Zangband 2.4.0 (what my mod is based on) then download Discband4.zip.(it may be named Discband4_win.zip)  unzipit to wherever you want and play. I did this so people not familiar with ascii adventures or who don't have Zangband already wouldn't have to dicker about with downloading the correct executables and then replace the correct files.
IF YOU ALREADY HAVE ZANGBAND 2.4.0,  or if you prefer to use a different version of Zangband, or if you DON'T HAVE A WINDOWS PC,  then you ONLY NEED TO DOWNLOAD  Discband4LIBS.zip.  It is just the modified .txt files and should work with different versions and ports though as i made the mods with Zangband 2.4.0 on a windows pc i cannot wholly vouche for their compatability with other versions. 
The original Zangband game in various versions and platforms can be found at http://thangorodrim.angband.org/ and at ftp://clockwork.dementia.org/angband/ .