Waves Update Plan could be a reference for PT Update Plan
 

- Waves charge $300 for a year of updates for their flagship bundles.
- Users can lapse for as many years they want and pay $300 to update at any moment without any additional fees.
- Users who paid $300 for WUP receive a $300 voucher to spend on plugins.
- Upgrading to a bigger bundle gives users free year of updates.