An Upgrade License is required for each Software Upgrade. Major releases are indicated by its version number, i.e. Software upgrades are major releases in which more functions/features have been changed or added to the software. To purchase the upgrade license, please log into Navicat Customer Center, click the Product Upgrade and Maintenance Renewal. Remarks: * The old license key will be invalid after upgrade license * Upgrade only available for license in version 10 or above How to buy the upgrade license? Customers who have failed to prove his existing ownership of his/her Navicat license will not be eligible for an upgrade license. Upgrade licenses are only offered to existing customers who are able to present a valid Order ID from their last purchase, as well as the registered email address and the Serial Number of their existing license. Navicat desktop software upgrade license allow customers who have purchased an older version of Navicat to upgrade to the latest version without paying the full license fee. Alternatively, customers who are currently subscribed to a Navicat Desktop Software Maintenance Plan will also receive free software upgrades.