Thank you both for the help!
Here's what I did + figured out:
1-
0.99f and
1.02 are the original versions of the software developed by Shinichi Nakamoto
2-^Aforementioned
home page of above [EDIT: Appears to not be homepage, but rather a reposting of Nakamoto's software later on]
3-
Oyajin Appointments ++ 1.36 is a source code based fork of Nakamoto's software. The developer who forked it is Takaaki Abe, of which their
home page was there
4-I compared MD5 hashes for the vector.jp "1.41" file for HPC, and compared with 1.36 for HPC, and concluded they're the same. Thus, 1.36 is the last H/PC compatible version based on what I found from the readme
5-version 1.02 and 1.36 were added to the SCL; credit given to thenzero + stingraze respectively
6-I also located note taker program by Nakamoto called
Oyajin Notetaker and added that to the SCL