I just found that "legacy" plugin in the repository. Thinking that it was a newer version I installed it and now I have both the previous and this last one. The fact is that the old plugin cannot be uninstalled because it says that is bundled. What we are supposed to do with this?
Also the new plugin removed my CuraEngine installation, the one that was used by the old plugin and now it seems I can't compile a new installation of it. (shows several warnings)