Evaluation version of Rhino 6 auto-downloads the Spanish version. In appeareance is the only option. How to download an English one?
The different language packs are part of the installer options under the Gear icon.
To add a language, open the Control Panel and go into the Programs and Features tool.
Find Rhino 6.
Select it and click modify.
Choose the languages you want added.
Solved! Thanks a lot.