We will send out emails to you once there are major updates from Kodi. Make sure your email is correct and our domain is in whitelist.
We also will popup notice in Kodi app about updates.
For Apple TV customers, you can always check for update from this URL:
https://www.koditvbox.tv/update/
All available versions of Kodi app are listed on their official website:
http://mirrors.kodi.tv/