This update brings:

+ Added config.
+ Added shiny option. (requires skRayFall)
+ Added back button for each GUI. (Auto added to last slot of GUI.)
+ Added update control. (may toggle via config)

- Removed amount & name from item lores in categories.
- Removed downloading option as it reduces performance.

~ Made default item lore better.

I recommend you to get a backup of your yml files and install new ones so that you won't get any errors.

Also, if you don't use skRayFall, you can easily change shiny option in items.yml to false. You will get error each time you refresh the skript but you won't have problems on GUIs.