Here's a Google Translate of the message on a1k.org
This year I sent a dump of the NTSC version to dlfrsilver and he created an IPF from it. The disks were in their original and perfect condition. The interesting thing is that the NTSC is obviously more recent vs. the PAL version. The PAL version bears the date 11/21/91, the NTSC version 3.3.92 - some of the files have different file sizes. Unfortunately I couldn't find a version number in the game - if someone knows something or has more information about the game, please let us know. Here is the IPF for backup - I delete it after a week. Have fun with it (remove pdf)
EDIT: As I have just noticed, the WHD version is not yet supported - so it has to be installed normally on HD. (Boot from the InstallDisk)
EDIT 2: See article from DingensCGN - check out which versions you have at home.
EDIT 3: The NTSC version should also work with the attached slave. Enter "PW" for the password query. (Replace this slave with the "old" one)
And
here are the attached files. Please note that the download link expires in 24 hours, if someone has a better place to host them, feel free to do it.
Edit: link updated to extend the files availability another 24 hours.