Hello,

There is no option to upgrade. You can purchase the license you need and then let me know the old order number/license key to get refund. Please be informed that the refund only can be issue if the old order is no more than 90 days.

Thank you

how to delete registered license

I didn't understand. You don't have to delete. If you already install the item with old key then you can download and update the files except `.env` file, `public/assets/` and `storage/app/` folder. Thank you