Latest version of ProDOS???

[dgdela01@homer.louisville.edu (Daniel G. Delaney)]

Hello all.
    What is the latest/last version of ProDOS and when was the last time
it was updated?
    Apple has a DiskCopy ProDOS disk image file called "Apple II System
Disk" on their FTP site. I downloaded it, extracted it, copied it onto a
800k 3.5" disk, and tried to boot it up on my newly aquired Apple IIgs. It
responded: "UNABLE TO LOAD PRODOS". Has Apple put a bad copy of ProDOS on
their FTP site, or what?
   Thanks.
 --Dan D.
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