It's important to note that, whilst the extension may work with phpBB 3.2.3, it has been abandoned by its author and there is no support for it.
This also means if future updates of phpBB cause it to stop working, it won't be updated/fixed unless somebody takes over its development.
Take note of the warning in that forum
phpBB wrote:WARNING: Extensions in this forum are not currently being supported nor updated by the original Extension author. Proceed at your own risk.
I was immensely fond of the 3.0 modification and am a little surprised a 3.x extension similar hasn't been put into development, so hopefully we'll see one soon