Tell us about your training.
My training went well, up until the last 4 weeks of it, I pulled a calf muscle on a short run, putting me out for a few weeks, and then adding a cold in the middle of it didn't help me any either.
Prior to that I did follow a plan with increasing mileage, and did all my long runs downhill. Despite it being a downhill course, I would recommend doing a combination of both uphill and downhill running.
I would t change my workout plan, but what helped me a lot was the use of compression sleeves for my recovering calves.