[ubuntu] How do I get the add ons I downloaded from Libre Office

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http://ubuntuforums.org – I downloaded add-ons for Libre Office and the default seemed to say they went to the Archive manager (Ubuntu 12.5). I SAW them there. I can no longer see them and obviously need to move them into Libre Office extensions. Please can anyone tell me how and where they went as when I click on archive manager I do not see them there! Thanks J (Hardware)