AdBlock+WebView Implementation Version Issue
Line 119 in the build.gradle script of the app module is implementation 'org.adblockplus:adblock-android-webview:5.0.1' but version 5.0.1 is not retrievable. This causes the app to be unable to build; removing the implementation results in a non-functional app.
Changing the version to + as suggested here solves the issue, i.e: implementation 'org.adblockplus:adblock-android-webview:+'
Currently, version 4.4.0 seems to be the latest retrievable version and using implementation 'org.adblockplus:adblock-android-webview:4.4.0' also solves the issue.
This is my first time attempting to build an APK from source so it may have been a mistake on my end, but luckily I now have a working extended release of the APK despite not being able to support the release due to not having the Google Play Store on my device.