Older Trainz Versions

Hi, I just downloaded Trainz 1.1 from the store (Free) and I saw that there were all Trainz versions in the store.
Today I went back to the store to purchase TRS2006 and saw that they all disappeared. Was it only a limited time offer?
How can I purchase older versions anymore?

It was a limited time offer although I believe N3V extended a deadline (although that may have only been for the registration side).

Shane

Oh, too bad. I thought they were a permanent store item...