Ten Years Later script

My theatre group recently did Ten Years Later as a benefit for our local LGBT center. When we started rehearsals we had a tough time because the scripts were different from each other! Mine was part of a book with both plays in it, published in 2011. Theirs was purchased from Dramatists, Inc. - the original one. The newer one was a more updated, kinder, more lovely version. Don't understand why they're still selling the older one.