If it's showing 300H V1.0 and Unixware then it should be V6.6, which was the latest, and would use V4.0 which would explain the KV53.
They didn't switch to Unixware until 6.6. The nice thing about unixware is that it is much more resilient in the face of power interruptions than the previous versions of unix. Before when you wanted to shut down the switch you had to go through an elaborate process. Now all you have to do is exe-updat for everything to make sure the memory is written out to disk and, assuming you don't have an ACD server, just dump the power.
There is nothing even remotely illegal about giving you the software because the licenses to use it are on the switch and have nothing to do with the disk, and you need to have a login and password anyway, but I don't know how to get it to you. Big brother is watching and frowns upon people giving out personal contact information on this site, and I'm only on here once or twice a day during the week so it would be gone before I ever saw it.
I'll try to make an ISO of the disk tonight and put it someplace you can download it from.