[SandMan]

I went to test this in game with a league I created and the schedule did not load. I did not test it earlier because I had no access to my test machine. (yes I have a test machine just for OOTP matters and schedules)... I had it set up with a balanced schedule to match the header. It gave me a format error. I changed everything to unbalanced and the schedule loaded perfectly.

When I create my schedules I always have the header say balanced =N/0
because I have seen this error many times. So I changed the file to read balanced NO, changed the format in game to unmark the balanced schedule box.. This will not matter in game. The box is checked only when you use OOTP generated schedules.

New schedules are posted here but I will not change the link above to the new schedule - some may find the version works.
BTW, my test machine is running OOTP14 to test schedules.

I have also posted my version with the comments same as OP but with the comments that I add to all schedules I work on and keep in my private collection. I have uploaded 12 team with no interleague that may be fun for some. 12 team is not just a mirror image of the 6 team, it has been created with the 6 team as a base and created using my modification utilities.