Rstowell, if you did not download Month 12 you will need to buy it from Sue Garman's company, the cost is $6.50.:
www.comequilt.com/shop/Block-of-the-Month-Patterns/Halo-Medallion-Quilt.htm
I really appreciate you asking how you can get the pattern you are missing. Being able to buy them now is a big plus with the Block of the Month. While they are no longer available free for TQS members, they are still available from the designer so you can finish your quilt.
Once TQS no longer has the rights to the pattern, which is now, no one can give you any of the pattern--that is a copyright violation and is unethical to boot. So, everyone, please honor the designer and their rights and buy what you need from the company that owns the pattern.