Steam guide refers to dead link. Maybe it is possible to retrieve patch from translation guides?
Topic on Talk:Hitman 2: Silent Assassin
but the guide does work
Guide does, link for patch does not https://drive.google.com/file/d/1fa7JBP9_9fgqGVIq4MF1Y9TMsJhn-WET/view?usp=sharing
For me and some other people in the comments, it shows "URL not found". Several weeks passed after requests, link still isn't updated.
Personally, I don't care, russian translation works without downgrade, but different localisations might need that patch.