The plugin has been updated for, and tested on, Snow Leopard and Logic 9. The new version also includes the three soundpacks which used to be optional. Version 1.5.3 for Mac OS X requires Snow Leopard and an Intel Mac.
Users who own a previous version can update to the new version for $99 by contacting MHC Synthesizers and Effects: here.
Pricing and Availability:
For a short time period, Ambient Keys is available for $179 (Windows/VST and Mac/AU) including the three soundpacks which used to be optional.