install kodi

Anyone here able to help out?

I updated my mac to the Sierra 10.12.5 and now it is blocking kodi krypton from downloading, saying it is damaged and must be sent to file when I download from kodi site. I tried to download kodi isengard 15.2 which actually downloaded but when I try to get an add on kodi says I have no internet connection, which I do. Anyone ever encounter this?? I use to have kodi but ever since the latest upgrade nothing seems to work. i contacted apple and they were of no use, anyone here able to help?