Mastery Development 'Perpetual Authorization' disk needed

[Jack Countryman <jcountry@seidata.com>]

The Mastery Development system was a lab setup that used Apple IIE for work
stations, and either a IIE or preferably a IIGS for server with a scsi
external hard drive.  The company seems to be gone.  However, in their last
year, they seemingly released a disk that would 'update' their hard drive
server volumes to allow them to continue to operate.  We've got two of these
systems we need to get going again, and need to find a copy of that disk.

There were postings on various Apple II lists etc. about this in recent
years, but none with an email for anyone who has a copy of the disk or a
working server hard drive for one of these systems.

Anyone know where I can find this perpetual authorization disk?

Thanks in advance...