Newbee need help

Hey all.

I am having trouble installing KODI- 17.0- Krypton_rc3-x86_64.dmg on my mac.
i get a warning message: The following file can not be opened.

system following:

macOS Sierra
Version 10.12.1

MacBook Pro (15-inch, Mid 2012)
Processor 2.3 GHz Intel Core i7
Memory 4 GB 1600 MHz DDR3
Graphics Intel HD Graphics 4000 1536 MB

What other information do you need.
Any help will be great.