Default [Q] Lost root after Mahdi ROM; SuperSU is unflashable

Everytime I try to flash the SuperSU update that comes with Mahdi ROM I always get an error saying that the file cannot be read. I tried sideloading it and I got nothing. I tried flashing other versions, and nothing. If I try to proceed without flashing it I lose root. Will I just have to give up on Mahdi ROM? Root was working fine on Stock JB. using d802.