There was a x64 version in the release, but it proved to be too buggy and slow compared to the 32bit version, and given 32bit exes work just fine in 64bit OSes, there was no need.
Said that, I must remind you discussion about non-public builds is not allowed in the forums, and that this is a spu2ghz thread, not pcsx2, so you should stay on topic. :P
Going back to topic:
I am fixing a few things more and going through my games, I will most probably upload 1.5 later this evening, hopefully fixing more than breaking... ^_^