Offline Raspberry pi 2

Hi I have an offline raspberry pi 2. (Kodi 17 – libreelec)

I want to install some add-on (functionality and skin and visualisation) from the official libreelec and Kodi Repos.

How do I get to them no via Kodi (Its offline) ?

I did find a Mirror on Kodi tv but seems to hit and miss if these addons will install via the “Install from zip” option

Its the visualisation ones I want really.