Didn't work for me. Downloaded viper-only.zip and flashed in TWRP 3.1.1.
No V4A-app, so I installed it manually and it tolds me to install drivers, did that n reboot and it still said install drivers.
I have a OnePlus 5
I'm on latest OOS with Magisk 13.3.
Do I need to upgrade Magisk to beta-version 13.6?