Either subscribe to the "Pro" or "Ultimate" membership, or purchase a Lifetime Key.
Once the installation is complete, you can use it in ZENOLOGY.
The Roland Cloud Academy offers a variety of how-to videos. For example:
Roland Cloud How-To: Make Basic Edits to a Preset in ZENOLOGY
Roland Cloud How-To: Find, Preview, and Save Sounds with ZENOLOGY Pro
Please visit https://www.youtube.com/@RolandCloud to find out more.