This release brings Kokua to parity to LL’s 6.6.16 release ( https://releasenotes.secondlife.com/viewer/6.6.16.6566955269.html ) which is a change to the build technology of the viewer with no user-facing effects.
Additionally, we’ve fixed a problem introduced with 6.6.15 where importing an AO set would fail with error messages about not being able to import the subfolder content.