Outdated Saves in updated version

After the auto-update to 1.0 I am no longer able to use my old game saves. Is there anyway to use those saves again or revert to the old version?!?! I was playing a game with the the non opt-in beta and bringing along the purple hat in XEN - so I really don’t want to start over all the way at the beginning.

Old saves can’t be used with updates. They are incompatable

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.