I do not have the "Edit Online" button on openoffice as I have seen on many forums or videos. For my business, there is no question of using Google Docs. So, I would like to have another way of doing the modification online. I tried using this method: https://github.com/zylklab/alfresco-share-online-edition-addon/wiki Without success.
In Alfresco Server, you need to copy the corresponding jar file in $TOMCAT/shared/lib and restart Alfresco service. Then you should see an action for editing MS-Office and Libreoffice mimetypes. Take note, that 0.3 version works for Libreoffice 5 and 0.2 version for Libreoffice 0.4 (don't mix them).
Finally, you need to register webdav protocol in you client machine (this is valid only for Windows and Linux, not MacOSX by the moment, with any recent browser). This instruction tells local operating system to open a webdav URI with Libreoffice client when clicking on the link. In releases page, you have some helpers for Windows and Linux.
If you client machine, from where you are going to edit online with Libreoffice client (not related with Libreoffice in server part), is a Linux machine, such Ubuntu, you can use two methods: