A looong while ago azw's stopped converting to epub because of a new version of the format. The solution at the time was to reinstall a previous version of Kindle for Pc and block it updating. Yeah you've guessed it I am still using 13.11.2017. (well it works!)
I am pretty sure that it has been fixed long ago but it is difficult to know what to search for. I cant find any thing about it being fixed.
Anyone know for sure if I can go back to getting updates for kindle for pc without it causing problems. I dont want to have to hunt for and reinstall the old version if it messes up.
