The various formatting models can be opened with LibreOffice 6, which you can download on the official website libreoffice.org
From the 1.2 version of LibreLatex, the models are not compatible anymore with the LibreOffice’s versions 5 or under.
In order to fully use the LibreLatex page setting, you have to activate the macros.
Only the macros activated inside the files .ott published on this website are guaranteed as trustworthy. Please respect the LibreOffice’s security instructions by desactivating the LibreOffice’s file’s macros when you aren’t sure of its origin.