While testing the plugins, I had to close Messenger, copy the plugin and restart Messenger. Not any more... I made this plugin installer and it is available for anyone who needs it
...
Anyways, here's how to use it:
-start a command prompt, then run the program like this:
MsgPInst(.exe) plugin.dll
It retreives the path automatically from the registry for you.
Please, report any bugs here. I've tested it and have not found any bugs, yet...