On my Fenix 5 I simply opened the beta ZIP and could cut and paste new beta files into the appropriate folders on the watch, however the folders in the Fenix 5 Plus seem to be read only and are greyed out so that I can't cut and paste or drag n drop beta files onto the watch. I have tried the properties but that does not see to help. Other are obviously coping new beta files onto the Fenix 5 Plus, so please let me know how you are doing it?
BTW my computer OS is Windows 10