That link was posted 8 years ago so it’s dead. Most links in this topic are most likely dead. If you search online hard enough you should be able to find it somewhere else.
Edit I found 2 files for you. One is a save with 999,999,999 money. The other is a 100% .gsx file that won’t open in Horizon so you must need to replace your .gsx file with this one or something like that. I’ve never played that game so I can’t help you any further.
Download link: MEGA
@Chris Close this?