Get it here: https://forum.zdoom.org/viewtopic.php?t=60436
The new update adds brightmap and monster support, and adds the Incinerator and Calamity Blade to Doomguy's arsenal, each having a 25% chance to replace the Plasma Rifle or BFG9000. In order to use the monsters, you have to load a new patch for Legacy of Rust, zmpatch-id1.wad, included in the Zagemod Extras folder included with the mod.