Fh5-update.v1.634.818.0.to.v1.642.644.0-with-dl...

Although Playground Games does not release detailed changelogs for every minor version bump, community reverse-engineering and official patch notes from adjacent releases reveal the following:

If you play on official servers (Steam/Microsoft Store with a genuine license), do not apply manual patches or DLC unlockers. The game’s anti-tamper system (Xbox Live + Arbitration Service) will detect modified binaries and issue a permanent multiplayer ban within 24–48 hours. FH5-Update.v1.634.818.0.to.v1.642.644.0-with-DL...

For offline-only or LAN setups (via Goldberg Emulator or similar), the v1.642.644.0 update with DLC unlocker works perfectly. However, be aware that: be aware that:

Yes. Even if you don’t buy the optional DLC, the stability and multiplayer fixes make this update worthwhile. The patch is relatively small, and no save data corruption has been reported. FH5-Update.v1.634.818.0.to.v1.642.644.0-with-DL...