1st make sure that you have not written any blocks using the extension that you want to remove. Now follow these steps,
- Download the aia file into your PC/Laptop
- Open the aia file with the help of WinRAR [ you can get this from web ]
- Now open Yourapps.aia\assets\external_comps here you’ll see the list of extensions that you have imported in your aia.
- Simpley click on the extension file and press Delete button to remove the extension from your aia file.
When you are done re-upload the AIA file to your dashboard. Hope this helps you out.