I recently performed a clean install of Rhino and noticed that my Libraries folder is missing, I have no Localization folder in app data and also there are no templates presented to choose from when I first open Rhino.
The latest build found here causes the issue:
I been searching and this seems to have happened before.
Incomplete Rhino 5 install without the language pack
Are you missing templates, toolbars, or plug-ins? This is a symptom that the language pack was not installed. This can be an incomplete or botched installation if you are installing from the downloaded installer. Or it can be an error in the install script if you are installing from an MSI script.
Can you confirm and fix asap?