I don't know if you have found your answer yet, but...

If you have a macintosh computer with a floppy disk drive...

Check out the apple computer web site (www.apple.com) - actually ftp
apple at ftp.apple.com, click on apple support area, click on software
updates, and click on your country of origin (likely English-NA), then
choose the link for Apple II. Look for Apple System Disk 3.2, and
download it.

What you will end up with is a compressed disk image. Double-click on
it to decompress it, and then open Disk Copy on the Macintosh. Open
the disk image (File -> Open) and then write the disk image to a disk
(one of the menus has an option for writing an image to a disk)...
place an unformatted 800k disk in the Macintosh disk drive (not high
density disk) and there you have it...

Turn on the IIc Plus and insert the disk.

Good luck.

Mike