The Fallout3_SlowLevel_Mod.zip file you have requested: Modifications / Gameplay Mods / Slow Level Mod - 6.16kb is not available. Perhaps try browsing all files for the game Fallout 3 and upload any files you want to share or are missing. This is the only information we could locate:
With this mod you need more XP to gain levels and also get less XP than a normal game for combat kills and other things. So you level up much much slower, giving the freedom to play slowly and not hit the level cap for a long time. All activites now This essential mod changes how the character levels up by reducing the XP gains. This allows the players to gain levels slowly before hitting the level cap and to enjoy the game.