WINDOWS - How to extract ChatStorage.sqlite

First of all make sure to have a recent unencrypted iTunes backup, like explained here. 

Then you can use any iTunes extractor to obtain the required ChatStorage.sqlite, like the free ones provided below:

• WazzapMigrator Extractor - free one-click extractor for both messages and medias
• iPhone Backup Extractor - free until 4 files extracted (enough to download ChatStorage.sqlite)
• iBackup Viewer - free

Now you just need to transfer ChatStorage.sqlite to your Android device in the Download folder.

If you experience any issue please use another extractor or contact me