The d3_1_1.exe file you have requested: Official Releases / Patches / DOOM 3 Update for Windows - 17.41mb is not available. Perhaps try browsing all files for the game Doom III and upload any files you want to share or are missing. This is the only information we could locate:
This is the official version of the beta patch which was released a few weeks ago but adds more fixes as well. A complete list of fixes can be seen below.