You should have been able to read the fact that it has been installed several times on Windows 7 and Windows 8 pro on a 2012 rMBP using the newest boot camp drivers, with no success. Unless, remaining in beta and declaring all is well is your goal. Then, yes, this is perfect software.
@khaneliman: 3-finger drag is THE feature of the Trackpad++, and in fact no user had ever reported it doesn't work, so, sure, I would like to help you. An idea: did you try to exit Trackpad++ Control Module from tray icon (right click its '++' icon for unveiling the quit option) and then reinstall?
@Quarc: Congratulations, you have just found a bug. An issue is, the option to disable trackpad was added primarily for testing purposes, and it doesn't disable device like Device Manager, but what it actually does blocks all the kinds of input individually (natively, i.e. inside the Trackpad++ driver). So, I forgot to block this specific gesture. This is it.
Is there a place for humor on these pages, I don't know, but, just to notice, the last two requests to some extent complement each other - only 3-finger dragging is working, and only 3-finger dragging is NOT working