Post is for people who's having hard time setting this up. There are plenty of posts out there (mostly in reddit) but missing some steps, so I decided to give this a try on what has worked for me.

1. Download game version 1.405.2.0 cracked by Empress

• (primary) search in https://doditorrent.org
• (backup) archive.md SLASH rYR06

2. Add the setup.exe as a non-steam game and proceed with installation
3. Once completed, add the ForzaHorizon5.exe as a non-steam game and force compatability to use Proton GE
4. If it's not yet downloaded, use ProtonUp-qt to install Proton GE
5. Download Goldberg emulator files

• (primary) mr_goldberg.gitlab.io SLASH goldberg_emulator
• (backup) archive.md SLASH hyYxh

6. Unzip file then copy all dll from /experimental folder to game folder. Backup original DLLs before proceeding.
7. If steam_appid.txt is present, edit and keep it empty. Otherwise, create this file with no contents or just delete it.
8. Play game in Gaming mode
9. Enjoy