Are the plugins for maya available on the Mac version of maya or maya lt now that the editor is?
What do you mean by plugin ?
Maya LT can export to the FBX file format. FBX files can then be imported in UE4. No need for a specific plugin for doing that. 
Sorry I should be more clear. I am referring to the skeleton tool add on for maya in the tutorials. Its integrated directly into the maya interface for 2013 and above, but it doesn’t mention if LT version allows it.