Note: You should have an already existing Windows Live Messenger install before using this as Windows Live Messenger needs a few dependencies.
So, while I wait for a response on my Escargot development server error post, I decided to make a batch file which allows for multiple Windows Live Messenger installations. This project took me several hours.
Requirements before using:
curl (https://curl.se/windows/, once downloaded, extract curl and then add the bin folder inside the folder you extracted to your PATH. Also install the certificate included.)
unzip (http://gnuwin32.sourceforge.net/packages/unzip.htm, just install and add the installation directory to your PATH.)
Github page: https://github.com/hypocracys/MultiMessenger
I would generally recommend using this tool for downloading vanilla clients to patch, since the Patched clients could be outdated in the future.
P.S: This was tested on a vista machine, if any problems should occur then please reply to this post.
P.S #2: The messenger versions are installed in %HOMEPATH%.