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31

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used  two special desktop files that were always open, so you could not eject these volumes.  This change was made because System 7.0 will use the “Desktop Manager” for all volumes.
Do you really need 6.0.4?
Unless you are using a Macintosh Portable or Macintosh IIci, the answer is “no.” 6.0.2 or 6.0.3 will suit you just fine.  6.0.4 will also work in harmony with Macs using 6.0.2/3 on a network so you don’t need to reconfigure anything at this time. However, if you are using a version older than 6.0.2, want to take advantage of some of the small enhancements, or are just one of those 
“gotta have the newest” types, go ahead and upgrade - it won’t hurt anything.
Installer
The most obvious change is a brand-new Installer (version 3.0). The Installer has 

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criticized for years for being difficult to use.
    The new installer user interface has been modified to allow users of different expertise levels to successfully install new systems and third-party software.  The program is now aware of the environment it is running in.  That is, it understands which CPU it is and builds the novice user’s default selections accordingly.
   The Installer can now use multiple source disks, and the number of disk swaps required to do an install has been drastically reduced.  The Installer does not make the user wait while it is figuring sizes.  Instead, a simple message comes up after the install is 
OK’d if there is 
not enough space 
on the proposed disk.