The following is a summary of the WPSSO Core Premium installation process. The complete and detailed installation instructions are available here.
Updating to WPSSO Core Premium is simple and easy — click on the “Purchase Premium Version” button on any SSO settings page. After your purchase, an email will be sent to you with a unique Authentication ID and installation instructions.
The WPSSO Core Premium plugin and its Premium add-ons use the complementary WPSSO Update Manager (WPSSO UM) add-on to check for Premium version updates. If you haven’t already installed the WPSSO UM add-on, please see the WPSSO UM installation instructions here.
Once the complementary WPSSO UM add-on has been installed and activated, enter the unique Authentication ID in the SSO > Licenses settings page. After saving the changes, an update for WPSSO Core will appear on the WordPress Dashboard > Updates page. To install and activate the new Premium version, update the plugin from within WordPress (as you would any other plugin).
If you use a WordPress multisite configuration, you may enter the Authentication ID either on the Network SSO > Licenses settings page (to license several sites at once) and/or in the individual site / blog SSO settings. Note that the default site / blog must be licensed to allow Premium version updates from the Network admin interface. This is a requirement of WordPress not WPSSO — WordPress uses the default site ID to manage updates in the network admin interface.