Adds the ability for players to preform a customisable number of 'double-jumps' while in the air. Within the script, there are a few other customisable parameters to allows for further customisation.
Select version for changelog:
Changelog
Updated description.
Removed a potentially confusing clause from the description.
In terms of activation, the pack works like any other. Go to behaviour packs in you world and click active on said pack.
If it still doesn't work in creative mode, try turning on the world's experiment options, and also content logs (settings>creator>content log gui)
Hopefully that helps :)