Please take note that now Blender 2.80 has become available for download, I wasn't aware of this as I didn't check the website until today 15/08/2019! And I uninstalled Blender 2.79b to try out Blender 2.80 and I immediately took noticed that none of the plugins for MSTS and TS20xx were not working in Blender 2.80
There is absolutely nothing wrong with the plugins at all, Blender 2.80 is setup differently has to how the Blender 2.7x plugins code was setup, it's a bit hard for me to explain since I'm not a developer!
My advice is to stick to Blender 2.79b until the authors do get around to upgrading their plugins for use in Blender 2.80
The download for Blender 2.79b can be found here
Click on: Blender 2.79b to go to the download files page! Download Blender 2.79b for your computer, my computer is Windows 64-bit so therefore I will download blender-2.79b-windows64.msi optionally I can download the .zip version, so make sure that you download the correct Blender 2.79b from the download page suitable for your computer
I hope this information helps!
Happy Blendering folks!!!