OpenGL bug

Im traying to open ue4and then it says You must have a Metal compatible graphics card and be running Mac OS X 10.11.6 or later to launch this process. but

  1. I have a mac from 2015
  2. I have macOS high sierra 10.13.3

1,6 GHz Intel Core i5

8 GB 1867 MHz DDR3

Intel HD Graphics 6000 1536 MB’
So why can i not to lunch ue4?