You need to delete old vesion , to install isengard , go to settings on main app page , in settings go to others , more settings , scroll down till you see apps and open scroll down again you see kodi app then uninstall once done , go back to main app page and Google kodi downloads and install isengard 2 can also get in playstore ,
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Here a link to install the paradox build .......
Cheers ......
Paradox Build & Wizard Add-on For Kodi 2016 | Tutorial : Iptv ...