Found on another site (below are DDL taken from it)
Code:
https://mexa.sh/a5luflriz90k/indigo.part1.rar.html
(mexa2 was dead at the time of this post)
https://katfile.com/kauxxdgb8ohh/indigo.part1.rar.html
https://katfile.com/22cs0qm244is/indigo.part2.rar.html
I have confirmed the operation of this game on Japanese Windows 7 SP1 x86 (VirtualBox 6.1)