LicenseControl allows you to de-activate/activate (i.e., move) a license whenever you want and as often as you want.

You need to de-activate the license on the currently activated system before you can activate it on another system — you cannot de-activate using any system other than the system and application version that is currently licensed. Technically, failing to do so is giving that license away with the switched-out system.

The LicenseControl documentation, available via LicenseControl's Help menu, has instructions on how to move a license from one system to another. Essentially, you need to De-Activate the license on the activated system so you can use it on (i.e., move it to) another system.

If the application is no longer installed on the currently activated system:

• download/re-install the LicenseControl'd application that's to be unlicensed — Note: it needs to be a version licensable by the same license (typically <5 minutes)
• access LicenseControl – typically, select the "Licensing..." menu or press the "Licensing ..." button
• select LicenseControl's "Find this Application's License and Activate It" radio button and press the "Next" button (<30 seconds)
• follow the on-screen instructions (<30 seconds)

If you encounter any problems with this process, capture screenshot(s) showing the License ID entry and the error and send it as an attachment to a problem report.

In OS X, you can view a system's Ethernet IDs (labeled as Hardware Address in older OS X versions) via the Network Utility (in /Applications/Utilities). In OS X 10.5 and later look in the System Preferences → Advanced... → Ethernet tab.  In older versions, the Network Interface pop-up menu on the Info panel shows information about each Ethernet device and en0 is the primary.

In Windows, you can view a system's Ethernet IDs (labeled as Physical Address) via the Windows command:
ipconfig/all

If the previously licensed system has "gone dead," see the FAQ regarding failed systems.