Radmin stores license information in the Windows Registry under: HKEY_LOCAL_MACHINE\SOFTWARE\Radmin\License If this key is corrupted by a bad uninstall, malware, or registry cleaner, the license check will return a “null” value and fail.
Radmin writes expiration warnings to the Windows Event Log (Source: Radmin, Event ID 1004). Use a SIEM or a simple scheduled task to email you 30 days before the license check will fail. radmin license check