THERE IS A NEW VERSION HERE: https://github.com/kiwibrowser/android/releases/tag/Betelgeuse
This version includes stability improvements and better extensions compatibility.
An issue with downloading PDF files has been resolved, and another issue where the extension window was sometimes connected to the incorrect tab.
You can now import .crx/.zip files and also user scripts (.user.js!) directly on chrome://extensions.
If you want to use or write your own filters, the extensions Nano Defender/Adblocker offer the best compatibility with Kiwi at the moment (according to the community).
81-1.apk (signed using Google key): release
Kiwi-20190419174255.apk (signed using dev key): dev version