It is definitely not the problem of your device that you have found suddenly that your repo is devoid of Neptune Rising and you cannot find it anymore. Moreover, the initial repo forerunners - Magicality and Blemo have now shut down and are hence not available anymore. It is now practically impossible to get these extensions installed and this is now an extra added hassle. People who still use Neptune rising will unfortunately now have to look for some other alternative options to go through their adventure on Kodi.