For the educational version, I would assume you go into MyArchicad and you can change your language in there.
Don't ask me how exactly, it has been many years since I have done that.
Then I think you would have to download the English version.
I have no idea if you can use the same educational license number though.
Or go to the main Graphisoft website and download the language version you want.
When you run it, it will ask for your license type.
choose Educational and try your educational license number.
I have no idea if that will work as I don't have an educational license.
It may be best to contact your local Graphisoft distributor and have a chat with them.
It is different if you have a commercial license, as they are locked to certain languages only.
You can download a different language version, but it may not work with the license you have.