Go to this forum page:
https://forums.civfanatics.com/threads/download-bug-and-bat-here.274636/
Click on the Download and it will take you to the place to get the actual download of BUG.
Installation instructions should be included but if not, here they are:
(if you are using a Mac there are one or two more things to do to make BUG work properly. IF you need that info, ask here and I will post that too.)
README for BUG
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1. Introduction
2. Installation
3. Configuration
4. Troubleshooting
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1. INTRODUCTION
BUG is an unaltered-gameplay mod for Civ4:BTS. This readme covers how to install BUG manually, but we recommend that you use the installer when you can.
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2. INSTALLATION
WARNING: You should never modify or replace the original BTS Assets files.
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AS A MOD
To install BUG as a mod so that you must load it to play, place the folder that contains this README file into your BTS's Mods folder.
C:\Program Files
Sid Meier's Civilization 4
Beyond the Sword
Mods
BUG Mod
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CUSTOM ASSETS
To install BUG so that it is always active with your games (this will allow you to use it with succession games and games you open from the CivFanatics forum), you must first copy the files and folders from the Assets folder into your CustomAssets folder. Next create a "BUG Mod" folder next to CustomAssets and copy the Info and UserSettings folders into it. Finally, copy the files inside PrivateMaps into BTS's PublicMaps folder.
At each step it is important that you tell it to overwrite files.
C:\Documents and Settings
<your user name>
My Documents
My Games
Beyond the Sword
CustomAssets <-- folders in Assets go here
BUG Mod <-- create this folder
Info <-- coyp these two folders here
UserSettings
PublicMaps <-- copy files from PrivateMaps here
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3. CONFIGURATION
Once you start a game with BUG you can customize how BUG looks by hitting ALT + CTRL + O to get to the BUG Options screen. It has many tabs to organize the settings, and they are all written to INI files inside the UserSettings folder. You can also change them in these files, but this is only necessary for a handful of options.
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4. TROUBLESHOOTING
If you are having any trouble getting BUG to work, start with our Troubleshooting wiki page:
http://sourceforge.net/apps/mediawiki/civ4bug/index.php?title=Troubleshooting
Post the information that page asks for to the Questions thread at our forum:
http://forums.civfanatics.com/showthread.php?t=242396
If you find a feature or option that doesn't work properly, please post to our Bug Reporting thread:
http://forums.civfanatics.com/showthread.php?t=241796