Propellerheads decided to discontinue ReBirth.....And it's now available for free at
www.rebirthmuseum.com 
You need to register to download, or if you own and have registered a Propellerheads product like Reason you can use that account
I haven't tried it yet, but I will tomorrow...
Propellerheads has also made a Reason ReFill of the original ReBirth drumsounds
