All released versions (except the latest) of Ostinato for Mac OSX are available here. If you are looking for the most recent release go to Ostinato 0.9
To support the project, pay any amount that seems fair to you for these downloads. You can enter amount as 0 to download for free. A Getting Started Tutorial will be sent to your email id one hour after purchase.
For more information visit http://ostinato.org