I am in the process of upgrading from A2 to A3 on 17" MBP. I had over 20 gb free hard disk space. I realize that is tight but by my read of the requirements I was ok. The install appears to have gone well however when I try to proceed to upgrading my library, I am told the "library volume has insufficient disk space". I cannot open the application. I am flummoxed! What do I do next. I thought about moving things off the hard drive, to provide more space, but how much? Can I move the library via the Finder, outside of the application? Will edits stay linked? First issue I have had with Aperture. Yikes!
UPDATE:
I spoke with Apple and they apologized as they are discovering that you need to have, at least temporarily, aprox 50% of the size of your library free for upgrading the library. In my case, I have a 160 gb library, so I need 80 gb free to upgrade. As I only have 21gb free, I am moving data to an external drive temporarily. I'll post conclusion... soon I hope!