The “V2” is the current version of the SmartThings plugin. If you install the smartapp through the “ST-Community-Installer”, this is the version you get.
[EDIT: I just saw that both versions are actually available in the installer. You do need v2 though to work with the new version of Homebridge]
If you cant resolve the issue I suggest you also post in this thread for help:
THere are many people smarter then me! 