www.spaceempires.com ????
probably you meant
www.spaceempires.NET ?
anyway, this Version of bab5 mod is _not_ compatible with se4 gold. you should have been noticed that it's located in the se4 classic mods section.
edit: SE IV Gold (latest Version is 1.91) is an expansion of SE IV Classic (latest Version 1.49), and mods for Classic are not compatible with Gold, since a lot of new stuff were added to the Gold Version (mainly to data files but also to the game mechanics).