May I ask, what are those functionalities? I don't think I've noticed something that ITHVNR lack. But yeah, using the old ITH there was a lot of games I couldn't hooked, so I searched for some solutions, then I came across the other version of ITH which was updated unregularly (the 2015 one), first version I got was the 2014 July one, then I think the last released version was 2015 March. It worked much better than the old ITH, then one day I had trouble with a game I wanted to play, so I ended up with ITHVNR, and never had any more problems with hooking again.
And I did CTRL F the first page but ITHVNR didn't show up, and I reread the OP it didn't mention it.