There are 3 ways to upgrade the OxyProject Assistant Trial Edition to the registered version of the product.

Register the trial edition using a product registration key
Request a product registration key (after you purchased a registered version of the product) by sending an email to sales@techinceptions.com.

Install the registered edition on top of the trial edition
Install the OxyProject Assistant registered version on top of your trial edition (after you purchased a registered version of the product).

Uninstall trial edition and install the registered edition
Purchase a registered version of the product.
Uninstall the OxyProject Assistant trial edition. Install the OxyProject Assistant registered version.

To understand which package gives you the best value based on your need,
visit OxyProject Assistant licensing and pricing.