You can download the Microsoft LAN Manager Client for DOS (referred to as LanMan in the following) for free by clicking here. You need 4 files: DSK3-1.EXE,DSK3-2.EXE,DSK3-3.EXE, and DSK3-4.EXE. While you're in the downloading mood, there are two text files that you might find somewhat useful. The first is the README.NOW file found at
ftp://ftp.microsoft.com/bussys/Clients/, and the second is the readme.txt file that gets created in the LANMAN.DOS directory once you're done installing Lanman to the hard disk of your DOS machine. See below for further installation instructions.
The "Microsoft LAN Manager 2.2c for MS-DOS" software provides much the same functionality as MSClient + "Microsoft LAN Manager (version 2.0 Enhanced)".