Upgrading from 1.0 or 1.1
If you are updating the extension manually, you need to deactivate the extension, delete the existing files via FTP (do NOT delete through the plugin admin panel), load the new files via FTP, then reactivate the extension. This will run an update process that will convert any single use codes to the limited use format.
You should complete this process even if you are not using any single use codes as the settings array is different to accommodate the limited use setting. To make sure your stored settings are correct, follow the process as described.
Once you’ve done this and are on version 1.2, you’ll be all set for automatic updates and updates can be managed completely through the plugin admin panel.
Upgrading from 1.2 or 1.3
You will be notified through the WP admin panel that there is an update to 1.4. This version is essentially 1.3 with a new license key API. Once you update to 1.4 and enter your license key, you will see there is an update for 2.0, at which point you can update to 2.0.
Note that the 2.x version sets up a new database table for invite codes. Any existing codes you have created should be automatically migrated to the new table during the update.