Porting Recovery

Hello, i have a wiko darkmoon and i'm using twrp 2.8... want to flash rom+gapps with android 6, but it says that i don't have system space avaibable when i do.. I think that with twrp 3 i can flash them and gapps too ! The problem is that i try to port twrp 3 to my phone but my stock recovery misses some files that are on the porting guide... Can someone help me please ? Device: Wiko Darkmoon, mt6582
Thanks !

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