Getting the 2.3.004 patch depends on which version of the game you own.
Navigate to C:\Program Files (x86)\Steam\steamapps\common\OMSI 2 (or your custom path). Copy the entire folder and rename it "OMSI 2 Backup." This allows you to revert if the patch fails.
While there is no singular formal "essay" authored by the developers regarding OMSI 2 version 2.3.004
