Hello,
Since version 2016, localized versions of Revit are no longer distributed as separate installation programs or in the form of add-on Language Packs. All supported languages are included in a single installation program.
You can select the installation (setup) language and the language of the main application - the language of your current environment is preselected.
During the installation, optional localized content is downloaded - libaries and offline help.

After the installation, you can switch Revit languages just by editing the "/language" parameter in Revit.exe runstring. Use the language shortcut ENU, DEU, FRA, ITA, CSY etc. You can use similar lang. switching also in Revit LT.
Eng. Iliev L. 



⁞|⁞ BIM Implementer, Project & BIM Manager, Coordinator, MEP Engineer
⁞|⁞ http://www.TechRoom.bg