If Export > Parallel Processing is missing then you are using the 32-bit version, which already turns it off to reduce memory usage. As @Hudson555x suggested, you might be running into memory limitations because the project was made at a higher resolution than what you are exporting. Also, when an export job fails, it reports the last successful timecode. You can look in your timeline for something shortly after that timecode for something complicated that might be causing a problem and then try to remove it temporarily to see if it helps.