You can give any filename you'd like to use. Copy 'pkzip.exe', 'pkunzip.exe', 'pkzipfix.exe', 'zip2exe.exe' and 'pkz204g.man' to a subdirectory in your path. To check your current path, type SET at the DOS prompt. You'll put splited 'huge.zip' back to one piece to restore 'jumbo.zip' and install the computer model. You should have 'jumbo.zip' in there.
Models are ready to be installed.