This installs the Zork I text adventure onto your hard disk.  It requires approximately 100,000 bytes of free disk space.

This will install both the Return To Zork demo as well as the original Zork I text adventure.  This requires approximately 2,500,000 bytes of free disk space.

This will install a demo version of Return To Zork on your hard drive.  It requires approximately 2,400,000 bytes of free space.