Btw, one of the easiest ways to install it is with FP Open installed - at least that’s how I did it.
- Download the file onto the external SD card of your phone.
- Start into TWRP.
- Perform a full backup of your system to the external SD card.
- Wipe the phone.
- Install the downloaded image of Lineage.
- Reboot.
Enjoy! 
If all of this sounds like black magic or vodoo, I would not recommand to try it. 
