I searched but couldn't find it, someone here posted a copy of IT.dll for Avisynth 2.5 and I'm looking for that again. I need it because decomb.dll doesn't want to work properly for me and IT.dll always works. It's not on this page either: Thanks!
the IT you found is modified by Nic, it called Ver 2.5 by adding 2.5 port, it can be loaded into AviSynth 2.5, but only work under YUY2. but I found one Japanese Programmer modified the IT into real YV12 version, here you are :D