A new version 2.4.1 of ZDoom is now available on the ZDoom Website where they have the compiled executable for Windows as well as the source code for this updated version of id Software's DOOM engine, which is available under the GNU General Public License. All they say about the release is this: "This version fixes a few issues that were present in the previous version." Thanks Ant via Doomworld, where they have further details on what's new.