My credit union discount for 2016 tax filing has disappeared. Can someone help me with my purchase?

I was working on my 2016 tax filing which is late. I had an extension, but I missed it. Now I cannot access what I was working on without buying the package.  I am ok with paying for the package, but my discount that was applied from my credit union has disappeared.  I was not aware of any expiration of my discount.  Can someone please assist me with this?