What is this? Even though this is not updated as of yet after the Anniversary Update, it is still required. If you are using Mod Organizer however, install it through Mod Organizer.
Change the file's extension from '.fomod' to '.zip', then extract its contents to Fallout 3 goty/Data. zip file and extract the file that comes with it. After it is done, press any key to close the prompt. Launch 'Patcher.exe' and it will install. How do I install this? Download the file and extract the files to where your Fallout3.exe is.
Makes the game 4GB aware and fixes the mod limit bug. Fallout Anniversary Patcher [What is this? Downgrades the game after the Anniversary Update for FOSE support and more.I heavily recommend doing the patches/updates IN ORDER so that nothing goes wrong.