Single-User, runs on one computer:

Big Business 5.0.1 for Mac OS X [20MB]

Server, runs on a server computer:

Big Business 5.0.1 Server for Mac OS X [25MB]

Client, runs on a client computer:

Big Business 5.0.1 Client for Mac OS X [11MB]
Big Business 5.0.1 Client for Mac OS 9.2 [14MB]