According to VanDyke Software, the licensing changes in SecureCRT 8.7.3 were introduced to enhance security and prevent piracy. The updated licensing mechanism relies on more robust encryption and validation techniques, making it more difficult for unauthorized users to crack or bypass the license key.

for users to test the application’s full functionality before purchasing. If you are experiencing technical issues with a valid license, it is recommended to use official resources. Valid License Activation and Management

SecureCRT 8.7.3 is an older version. Check if your maintenance plan allows for an upgrade to the latest stable version (e.g., 9.x), which may resolve compatibility bugs.