Yes, you can upgrade your license. If you are using a $29 license and want to upgrade to a $99 license , You will pay $79 only to upgrade your license.
Go to your-account. First, You need to login , click on the ‘Purchase History Tab’ . Check the last column ‘ License Keys’. If you have more than one rows in the table, Choose the product which you want to upgrade. Click on ‘ View Licences ‘ of that product. The next page will appear with a table. Check the last column of that table “ Upgrades “. Click on it and start the checkout process.
that’s it. Easy ??