I'm not able to find an answer, so the "admin engine" isn't integrated within 3.4.e or I have to download Activiti (5.5 ?) to "read" Alfresco workflows ?
Activiti will be fully embedded (admin UI included) in the future releases ?
I'm new too with Alfresco 3.4e and I think, there's not yet an admin UI for activiti Wf. You can dl and instal Activiti 5.5 but you can also work with activiti plugin on Eclipse. Careful, this plugin seems to have compatibility pb with Eclipse sts. So, I've instaled it on a classic version of Eclipse and it works fine.