I have not needed to root android in years. Can you share why you need this? There has to be a better way.
Read http://www.androidpolice.com/2016/12/24/how-to-follow-the-new-lineage-os-online/ about what phones are supported and the benefits. It will by default be rooted.
Remember I already know what rooting is. Here I don't need it since all I ever needed was to allow third party apps. Some folk go get a root program since they didn't know a setting. Shame about that.
Have posted this more than once... Is there some tabu on this phone? Have read about "King Root" but have no idea about where an authentic download can be found. Looking to start all over with this device.

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