On 26 Jun 2023, Tim Whitson said the following...
 
 TW> Al responded to my email and stated he did not offer key files for
 TW> Meldom in DOS.  He also was advised not to allow someone to develop a
 TW> new key file generator.  So if one is now made I can't use or post it. 
 TW> I did ask if he'd be willing to sell the rights to the DOS version but
 TW> I've not gotten a reply on that yet.  We shall see.

probably simply can't because the source code was lost

--- Mystic BBS v1.12 A47 2021/12/25 (Windows/32)