The Kiprun 500 and 900 GPS watches do not have a built-in barometer. Because of this, they cannot support structured workouts that have Effort Pace or Power. These watches also do not support Strength mode.
If you are trying to sync a structured workout to your Kiprun watch, and the app prompts you with a message to please update the watch firmware, please check if the workout is a Strength workout or includes Effort Pace or Power as the intensity type. If it does, please edit the workout to remove these details and then try syncing with your watch again.