Teradata Client 15.0 to 15.11 for c# dot.net builds

Hi,   Work for a big company.   Recently we had a forced 15.1 from 15.0 Teradata Client install on our laptops where I do my c# builds.   Everything (builds and runtime) ran fine on my laptop but when I move my executable to a dev machine it failed with "System.IO.FileNotFoundException: Could not load file or Assembly "Teradata.Client.Provider".  " I guess I'm not too surprised but I really thought I would have to delete the 15.0 Teradata.Client from my dot.net References and re-add the 15.11 Teradata.Client...  to get it to use the new driver in the builds.   How did my build just automatically switch over to the 15.11 driver?  This forced install looks like it deleted my 15.0 Teradata Client files.