I will briefly explain how it works:
After installing the plugins, you have to update them.
The PRO asks you for version 1.4.0 or higher, which some posts above have uploaded; With that, the message that "it is not working correctly" should not appear.
Then another problem when translating is that the "default" language will appear directly selected and does not give you the option to choose another. That's because it actually uses the Google API and creates temps right there in Google.
The solution that I have found is to translate another language first, for example US English, and then choose your language, the one that really interests you, and now it should let you choose since it now has US English as temporary.
I hope it helps someone.