FOR RYZEN USERS
I found this in a forum, it works for Ryzen 3, Ryzen 5, Ryzen 7, Ryzen 9, and Ryzen Threadripper!
"I took a closer look and it looks like it is using some kind of 2017 version of Unfold (assuming by the name of the new file that appeared in bin folder of Update 3)
There are two new files in Update 3 for Maya 2019:
unfold3dlib.dll - 99.8MB - sha1 a9799263f360ed3c860980c986aefd5031fe0591
UnfoldShim2017.exe - 122kB - sha1 38a508efe9df78ab8b8f4bfc54edac7628bdc48c
So there is a way how to run Unfold3D in Maya 2020.1 now (if you are running on Ryzen or Threadripper):
1. download and extract unfold.rar
2. copy and replace files in C:\Program Files\Autodesk\Maya2020\bin
(UnfoldShim2017.exe is already renamed to UnfoldShim.exe, so you just need to replace the file, consider backup the original)
Also I did some quick test with unfolding teddy bear model, most UVs were unfolded with just slightly difference and one UV shell wasn't unfolded properly.
Personally I would be happier with 1:1 result but it is still better than nothing or Legacy mode."
