According to the official NFO (release information) files posted alongside the download, the patch does the following:
This update specifically targets major technical hurdles encountered by users: resident evil 2 upd crackfixcodex new
For educational and technical analysis purposes, this article explores what a crackfix is, how groups like CODEX interacted with the RE Engine, the performance implications of DRM, and how to safely maintain your game installation. What is a "Crackfix" in PC Gaming? According to the official NFO (release information) files