I was wondering what version of Maya is used internally at Epic, with the ART tool for animating/rigging. I know that 2012 to 2014 are supported, but I was wondering if internally there was a preferred version.
Thanks
We use Maya 2013 (64 bit) here for our internal projects 
When will the Maya ART plugin be patched for Maya LT 2015?
That’s on Autodesk to support python in Maya LT. Until they do, the tools will not work. Consider going here to upvote python support
http://mayaltfeedback.autodesk.com/forums/215180-ideas-for-maya-lt-forum/suggestions/5698646-python