Once you've completed the Rent-to-Own program for your XLN Audio plugin, you can find the serial number here: https://splice.com/plugins/your-plugins
From there, please head to xlnaudio.com/register to register it at XLN Audio's site.
You'll then download the XLN Online Installer and Reinstall XLN Audio plugin via the XLN Audio Installer.
You no longer need to have the Splice application running or an internet connection to use your XLN Audio Plugin.
If you're having any issues, please be sure that you have installed and run the XLN Online Installer. You can download it here: https://www.xlnaudio.com/install
If you already have the XLN Online installer installed, it's likely you have created two XLN accounts and are logged in with the wrong account. If this is the case, please log out to the XLN Online installer. Then log into the XLN account tied to your product, and upon launch, follow the steps in the installer.