Yes, ISBoxer works with WoW Classic, just like it does with WoW retail!
Tip: Launch your team but it launches Retail instead of Classic?Solution here!
ISBoxer version 42.17.0815.2 is now available with a new mode for Per-Window gameplay style built into the Quick Setup Wizard. This mode is now used by default for World of Warcraft, which of course now prohibits Input Broadcasting. The new system works much like the old system, except that you press keys in each window yourself. Here's how to get started now! https://youtu.be/qigNCwcSDdw