Once you've completed the Rent-to-Own program for your Output Plugin, Splice will email you a copy of the serial number to the email associated with your Splice account.
Delete this file from your drive:
macOS: MacHD/Library/Application Support/Output/Portal
Windows: By default the Windows installation path is: C:\Program Files\VSTPlugins
Register your product with your Output account at https://output.com/register
Next, download Output Hub, launch the application and sign into your Output account. Find your product in the 'My Products' area and click 'DOWNLOAD' to begin the installation. You'll no longer need the Splice desktop app to use the plugin.