I am an Android Dev and we are using Sinch in our App for a very long time recently we were updating our app to SDK 31 and we were getting issues. We were using Sinch 3.14 which is very outdated but now we do not have time to update it to Sinch 5.10 due to time shortage I am looking forward if I can get Sinch 4.8.6 file so, for now, we can Publish our App and for a revamp phase we will be updating our app and Sinch.
The latest SDK version for Android is 5.10.7.
You can download this here: https://developers.sinch.com/docs/in-app-calling/sdk-downloads/
Version 4.8.6 is no longer available for download as there is a new major version, so please proceed with that.
Good luck with your project.