If it's buggy you need to let the author know so they can fix and re-issue it.
"Comments, questions, problems, bug reports etc. can be posted in the Windows Media Player Plus! thread at the Hydrogenaudio Forums"
They have a forum for this one so post where they ask you to for the best help.
I've downloaded and installed "windows media player plus!" to WMP.
At first great, what a sweet plugin but after closing WMP and re-opening it,
Plugin gone, wmp the same as it was before I installed it ???
Please can someone help me fix this ???