Cheers!
If you’re in maya 2014 or later, something has changed with the UI code and the windows no longer build to the right size, so certain elements look clipped off, but you should be able to resize the window to access them. (I get around this in v2 by just not using Maya’s UI commands).
As for the ‘definitive’ version, the latest is always available on github here:
https://github.com/EpicGames/UnrealEngine/tree/master/Engine/Extras/Maya_AnimationRiggingTools
(to access that page, you just need to link your UE4 and github accounts https:///ue4-on-github)
However, nothing binary can be uploaded to github, so the joint mover file and icons are not up there, but those don’t change often at all.
Unfortunately, with the release cadence slowing down, using the versions that ship out with the releases usually means that they get behind rather quick. Dropbox was a temporary solution until we got the live github mirroring working, which it does now.
As for the skin_geo thing, do you have some repro steps for that? I tried everything I could think of to try to reproduce the error, but I wasn’t able to get it. If you have any steps to get to that error, that would be super helpful.