I'm running 10.9.5 on an iMac. Patch seemed to work fine: Added LC_LOAD_DYLIB to /Users/MYFOLDER/Library/Application Support/Steam/steamapps/common/Rocksmith2014/Rocksmith2014.app/Contents/MacOS/Rocksmith2014 logout [Process completed] ... Then I got these errors: (Finder) You can’t open the application “Rocksmith2014” because it may be damaged or incomplete. (Steam) Failed to start game (unknown error)