Solved office 2013 install new interface language

I downloaded the hebrew language pack for my version of office, but it won't install. It says I am running the "preview" version of office, and I can't install a language pack on it.
True that I once had that version, but now, I am running an activated professional plus with all updates.

I then tried downloading a full installation file for hebrew office 2013, and choosing the "repair" option instead of "install". It "repaired" everything, but I still don't have an option for hebrew interface in the language tools.

Is there a way to manually install the language interface files I need?

solution

okay, I installed the hebrew\english version on top of the existing english-only version. It did not mess up anything, and it installed the hebrew interface option that I needed for a certain user account.