After downloading the upgrade, although the samples all seemed to extract, opening Aria both in Overture 4 and as a standalone it can't find any samples for any instruments. Any ideas? Reinstall?
I've had a similar problem when I tried to install GPO4 on my computer. It helped when I moved the unzipped folder to the desktop and installed the content from there. It seems like the installer doesn't like long access paths.
I hope this helps.
Copying the .zip file onto a DVD and reinstalling from there did the trick.