Mingle forum plugin is no longer available, it is not being developed anymore, I guess.
The code is available here: https://github.com/cartpauj/mingle-forum
Mingle forum support page: http://ww.wp.xz.cn/support/plugin/mingle-forum
I had a problem with a conflict Mingle Forum plugin, it occurred after updating the Wiki Lite. Unfortunately, I had to stop using the Mingle Forum.
Kaspar
