I had the same issues with AutoCAD, Architecture, Civil 3D, Inventor, Mechanical and MEP. Intermitant failures of the language packs for all of these. When I looked in Windows event viewer, I saw MSI error 1638. The application is already installed.
I did what colemanb said and changed the MST with my GPO deployment and used the MST with the main application itself. It worked on all of my installers and none have failed since that point.
Thanks for the info colemanb. It saved me a ton of work.
A special note to Autodesk: You might want to check your MST files and see if you are usign the wrong Product GUID in your MST files. I use AdminStudio and that is what it uses to determine if a product is installed.
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