Couple of things you could do to improve this:

1. use MSXML2.SERVERXMLHTTP.6.0 MSXML2.SERVERXMLHTTP.3.0 or MSXML2.SERVERXMLHTTP instead of MSXML2.XMLHTTP.6.0.
2. Make use of .responseXML and its methods for walking the html tree instead of parsing the body
3. Instead of creating an instance of wscript(via MSScriptControl) and then calling the jscript, you can create an instance of the XHR directly

Update - June 12th, 2016

I have moved the codebase to github.
This page might not be updated moving forward

Update as of March 12, 2016 v0.2.4

Fixed excessive commas not raising correct error.

Update as of Feb 28, 2016

Fixed typo that broke script for all clients except adiirc 64bit

Updates as of Feb 25, 2016

Changes: AdiIRC 32bit support
Changes: AdiIRC 64bit support (requires 3rd party dll to work)

Moving to github

I've moved this project to github in hopes of alleviating some of the headaches caused by maintaining 5+ pages for what is essentially the same project. I also hope the move will motivate others to get involved and contribute to the codebase

I may or may not update this page to reflect the current state on github but the github page will be maintained as long as the scripts remain viable.

Updated mTwitch.StateToTopic.mrc to v0.0.0008
Updated mTwitch.OAuth.mrc to v0.0.0003

Set module as depreciated; will be added to mTwitch.Core.mrc

Updates

v0.0.0005: Reworked if statement fix from v0.0.0003
v0.0.0004: Removed -n from /parseline; should fix the topic being reset when it shouldn't
v0.0.0003: Fixed bad if statement

Updates

v0.0.0005: Added better environment checking.
v0.0.0004: Added 005 token injection; $network is now filled with twitch.tv for twitch servers
v0.0.0003: Fixed $mTwitch.isServer() returning $false for twitch servers
v0.0.0002: Added on Unload event