Placing this in your ROM is actually quite easy.
Firstly, you should have checked out the instructions for building or acquiring this ROM
You should put the downloaded apk in the following folder:
The APK goes in /system/priv-app/OTAUpdates/OTAUpdates.apk
The APK goes in /system/priv-app/OTAUpdates.apk
Yes! There is also a library to extract from the OTAUpdates.apk and place in the system folder.
Install ADB and run this command
adb shell
cat /proc/cpuinfo
You may see "armeabi", armeabi-v7a or arm64-v8a
Now you you know which ARM architecture to use, you can open the OTAUpdates.apk and head into to OTAUpdates.apk/lib/ folder. Open the folder necessary for your ARM Architecture and extract the libbypass.so.
In your ROM you should now place that lib into /system/lib/libbypass.so