How to install xposed framework

I've watched many youtube vids on how to flash and stuff but whenever I get that far and try to install the framework through twrp it keeps telling me I'm using the wrong file so can someone point me in the correct direction
Phone : SM-G920W8
Kernel: 3.10.61 unibase kernel
Firmware: 5.1.1

Any help would be much appreciated.

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