Thank you for your post into the forum.
SQL Backup has two major components:
1. SQL Backup GUI - This component is not cluster aware and does not require licensing and activation. It can be installed on as many machines as required including workstations. The GUI is for managing your SQL Backup, backup and restore activities.
2. SQL Backup Server Components - This components does require licensing and activation and this installer is cluster aware. The server Components is the part that performs the work. When installed a service is created on each node called the SQL Backup Agent and 9 Extended Stored Procedures are created in the SQL Instance master database.
To answer your questions:
1. How do I get the client software loaded on the passive node?
2. Do I have to have one license per node, and if so, how would I register it?
Answer 1 - To install the SQL backup GUI on the other node, simply run the SQLBackup_18.104.22.168.exe or the SQLToolbelt Installer.
Answer 2 - The SQL Backup GUI does not require any activation. However the server components do require activation. There are two methods for activating on a cluster. From the SQL Backup GUI ->Tools ->Utilities ->Cluster Activation Wizard or locate an executable called ProductActivation.exe, you will find by default in the GUI install folder \\Program Files\\Red Gate\\SQL Backup 6 or \\Program Files (x86)\\Red Gate\\SQL Backup 6 depending if your system is 32-bit or 64-bit-bit.
Each node of the cluster will require a licensing and activation.