If your getting this error message (like i did) heres the fix.
Serialization Corruption Fix
- Go into the game files and find the pak folder.
- If you have a folder called “~mods” delete it.
- Reinstall the dlc or game (not sure if this is required but it did help me).
I think the problem is that since ruin is technically a new game, mods for security breach don’t work. So you do need to delete your mods out of the game unfortunately. I’d reccomend saving your mods somewhere incase you want to use them again.
Hope this helps!