error The name 'GoogleTranslation' does not exist

Hi,
It seems that something got corruted when updated, and possibly the GoogleTranslation.cs was deleted or moved.

My advice is to delete the folder Assets/I2
and install again. That should fix all those errors.

Hope that helps,
Frank

hmm, I'm not sure what could be happening.

I just tried importing 2.8.0f3 directly from the AssetStore into a 2017.1 clean project, and it worked without issues. I also tested in Android and WebGL without problems.
Could you create an empty project and import I2 Localization there, just to overrule that there is any file in your project that is preventing the project to compile.

If it works fine for you in an empty project, then manually copy all the files and see if that makes it work.

If no luck, then I would close unity, and either delete all the dll inside the library folder (or delete the library folder and let it rebuild, if your project is not that big). Its for sure that there is something corrupted, and doing that should force clean all from scratch.

Please, let me know how it goes, I have no clue what else could be happening.