Clarification on how the Aperture 2 Trial works -- and why
This was done intentionally to protect customers from inadvertently upgrading a library they subsequently would not be able to open. Since Aperture 1.5.6 can't read a v2 library, we didn't want anyone to unthinkingly upgrade their existing Library using the trial, only to discover 30 days from now, that unless they actually buy Aperture 2, they can no longer access it.
The Aperture 2 Trial is intended to take the app on a test drive. You can import new images into it and even import whole projects that you created in Aperture 1.5. It is fully functional and can support a library of any size you choose to create. But to actually upgrade you existing Library -- a one-way "no turning back" process -- you need to license it.
This way, you're not converting your library into the up-to-date format until you know you'll be sticking with Aperture 2 and it is completely safe to do so.
We've modified the text on the Trial download page to make this clearer. Hope this helps!
Joe Schorr
Sr. Product Manager, Photo Applications
Apple