A number of users have had issues whereby the license activation has been lost during the Windows 10 upgrade process. This might not be apparent immediately, because ReefMaster may not check the license state every time it is run.
As a precaution, we would strongly advise that you deactivate your ReefMaster license before upgrading to Windows 10, and reactivate once the upgrade is complete.
If a license activation is "lost" then please email us at This email address is being protected from spambots. You need JavaScript enabled to view it.
with either your license key or the email address that was used to purchase the license, and we can reset the activation remotely.
To deactivate your license, click the Deactivate License button that can be found in the About ReefMaster window, which can be displayed by clicking the top button of the main toolbar.