Things are starting to look good based on recent feedback. Therefore I am happy to call beta 5 our first release candidate.
Beta 5 RC1 includes performance improvements, minor bug fixes, a link to the support page in the help menu, a warning when a library change is detected, updated credits, and support for license files.
Upgrading to RC1 is easy right in Aperture Exporter. Simply use the AE menu item Aperture Exporter, Check for updates.