After upgrading to windows-10 from Window-7, Primavera P6 often gives language error i.e.
“Cannot file language file, C:\Prgram Files (x86)\Primavera\Project Management\Languages\comCaptions en-us”
This error is also find on installing Primavera P6 on windows 7. When this error comes then don't uninstall & re-install Primavera P6, Its quite easy to solve this issue by just copying the Language folder from the setup folder to the installed location as shown in the error message.