From The Document Foundation Wiki
- Download the template and save it anywhere on your computer.
- In LibreOffice, import the template into a template folder:
- Choose ▸ ▸ .
- In the Templates dialog, on the bottom right, click the Import button.
- In the Select Category dialog that pops up, select the required template folder. Usually this is My Templates, but you can choose or create any folder you wish.
- A standard file browser window opens. Find and select the template that you just downloaded. Click Open. A thumbnail now appears in the list of templates.