Single-User, runs on one computer:

Big Business 4.2.8 for Windows [18MB]
Big Business 4.2.8 for Mac OS X [20MB]
Big Business 4.2.8 for Mac OS 9.2 [24MB]

Server, runs on a server computer:

Big Business 4.2.8 Server for Windows [23MB]
Big Business 4.2.8 Server for Mac OS X [24MB]

Client, runs on a client computer:

Big Business 4.2.8 Client for Windows [8MB]
Big Business 4.2.8 Client for Mac OS X [8MB]
Big Business 4.2.8 Client for Mac OS 9.2 [10MB]