*You probably already know it because it is very simple =) but first fix the Crosstalk or Escargot server issue if you haven't already (in case you don't know):

Installation Guide:

To install Messenger Plus! Live, you need to download the installer from the official Messenger Plus! Live website. After downloading, run the installer and follow the on-screen instructions to complete the installation. Once installed, you can open Messenger Plus! Live and start using the extra features it provides for Windows Live Messenger or Skype (download below).

Download link for Messenger Plus! Live: Download