Tried installing this addon today on vB 2.2.10, but the installer just hanged, with the forum giving the error "One or more add-ons currently have actions pending and may be in an inconsistent state. Because of this, some errors may be suppressed and unexpected behavior may occur. If this does not change shortly, please contact the add-on author for guidance."
The addon page shows the addon as action pending, and on mouseover that displays the last action as "install:1".
The addon installed just fine on my test forum a few months back, but that would've been installed on 2.2.8 or 2.2.9, so it may be it's an issue specific to installing on the newly released version?